diff --git a/adminfront/src/features/tenants/routes/TenantGroupsPage.tsx b/adminfront/src/features/tenants/routes/TenantGroupsPage.tsx
index bc2c22fa..da214dc2 100644
--- a/adminfront/src/features/tenants/routes/TenantGroupsPage.tsx
+++ b/adminfront/src/features/tenants/routes/TenantGroupsPage.tsx
@@ -2,13 +2,16 @@ import {
   type UseMutationResult,
   useMutation,
   useQuery,
+  useQueryClient,
 } from "@tanstack/react-query";
 import type { AxiosError } from "axios";
 import {
+  ArrowRightLeft,
   ChevronDown,
   ChevronRight,
   Plus,
   RefreshCw,
+  Search,
   Shield,
   Trash2,
   UserMinus,
@@ -27,8 +30,18 @@ import {
   CardHeader,
   CardTitle,
 } from "../../../components/ui/card";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from "../../../components/ui/dialog";
 import { Input } from "../../../components/ui/input";
 import { Label } from "../../../components/ui/label";
+import { ScrollArea } from "../../../components/ui/scroll-area";
 import {
   Table,
   TableBody,
@@ -44,6 +57,8 @@ import {
   createGroup,
   deleteGroup,
   fetchGroups,
+  fetchTenant,
+  fetchUsers,
   removeGroupMember,
 } from "../../../lib/adminApi";
 import { t } from "../../../lib/i18n";
@@ -223,6 +238,7 @@ const UserGroupTreeNode: React.FC<UserGroupTreeNodeProps> = ({
 function TenantGroupsPage() {
   const params = useParams<{ tenantId: string }>();
   const tenantId = params.tenantId ?? "";
+  const queryClient = useQueryClient();
 
   const [newGroupName, setNewGroupName] = useState("");
   const [newGroupDesc, setNewGroupNameDesc] = useState("");
@@ -231,13 +247,35 @@ function TenantGroupsPage() {
 
   const [selectedGroupId, setSelectedGroupId] = useState<string | null>(null);
 
+  // Modal States
+  const [isAddMemberModalOpen, setIsAddMemberModalOpen] = useState(false);
+  const [isMoveMemberModalOpen, setIsMoveMemberModalOpen] = useState(false);
+  const [memberActionTargetUserId, setMemberActionTargetUserId] = useState<string | null>(null);
+  const [userSearchTerm, setUserSearchTerm] = useState("");
+  const [groupSearchTerm, setGroupSearchTerm] = useState("");
+
+  // 테넌트 정보 조회 (slug 획득)
+  const tenantQuery = useQuery({
+    queryKey: ["tenant", tenantId],
+    queryFn: () => fetchTenant(tenantId),
+    enabled: tenantId.length > 0,
+  });
+  const tenantSlug = tenantQuery.data?.slug;
+
+  // 해당 테넌트의 사용자 목록 조회
+  const usersQuery = useQuery({
+    queryKey: ["users", { tenantSlug }],
+    queryFn: () => fetchUsers(1000, 0, undefined, tenantSlug),
+    enabled: !!tenantSlug,
+  });
+  const users = usersQuery.data?.items ?? [];
+
   // 그룹 목록 조회
   const groupsQuery = useQuery({
     queryKey: ["groups", tenantId],
     queryFn: () => fetchGroups(tenantId),
     enabled: tenantId.length > 0,
   });
-
   // 그룹 생성
   const createMutation = useMutation({
     mutationFn: () =>
@@ -318,32 +356,48 @@ function TenantGroupsPage() {
     },
   });
 
+  // 멤버 이동 (Remove -> Add)
+  const moveMemberMutation = useMutation({
+    mutationFn: async ({
+      sourceGroupId,
+      targetGroupId,
+      userId,
+    }: {
+      sourceGroupId: string;
+      targetGroupId: string;
+      userId: string;
+    }) => {
+      await removeGroupMember(tenantId, sourceGroupId, userId);
+      await addGroupMember(tenantId, targetGroupId, userId);
+    },
+    onSuccess: () => {
+      toast.success(
+        t("msg.admin.groups.members.move_success", "멤버가 이동되었습니다."),
+      );
+      groupsQuery.refetch();
+      setIsMoveMemberModalOpen(false);
+      setMemberActionTargetUserId(null);
+    },
+    onError: (error: AxiosError<{ error?: string }>) => {
+      toast.error(t("msg.common.error", "오류 발생"), {
+        description: error.response?.data?.error || error.message,
+      });
+    },
+  });
+
   const groupTree = groupsQuery.data
     ? buildGroupTree(groupsQuery.data, tenantId)
     : [];
 
   const handleAddSubGroup = (parentId: string) => {
     setNewGroupParentId(parentId);
-    // Optionally scroll to the create form or highlight it
   };
-
-  const handleAddMember = (groupId: string) => {
-    const userId = window.prompt(
-      t(
-        "msg.admin.groups.prompt.user_id",
-        "추가할 사용자의 UUID를 입력하세요:",
-      ),
-    );
-    if (userId) {
-      addMemberMutation.mutate({ groupId, userId });
-    }
-  };
-
   const currentGroup = groupsQuery.data?.find((g) => g.id === selectedGroupId);
 
   return (
-    <div className="space-y-6 mt-6 flex flex-col h-[calc(100vh-theme(spacing.32))]">
-      <div className="grid gap-6 md:grid-cols-3 flex-1 min-h-0">
+    <>
+      <div className="space-y-6 mt-6 flex flex-col h-[calc(100vh-theme(spacing.32))]">
+        <div className="grid gap-6 md:grid-cols-3 flex-1 min-h-0">
         {/* 그룹 생성 폼 */}
         <Card className="flex flex-col min-h-0 bg-[var(--color-panel)] md:col-span-1 border-primary/20">
           <CardHeader className="flex-shrink-0">
@@ -544,7 +598,7 @@ function TenantGroupsPage() {
             <div className="flex justify-end mb-4 flex-shrink-0">
               <Button
                 size="sm"
-                onClick={() => handleAddMember(currentGroup.id)}
+                onClick={() => setIsAddMemberModalOpen(true)}
                 disabled={addMemberMutation.isPending}
               >
                 <UserPlus size={14} className="mr-1" />
@@ -563,7 +617,7 @@ function TenantGroupsPage() {
                         {t("ui.admin.groups.members.table.email", "이메일")}
                       </TableHead>
                       <TableHead className="text-right">
-                        {t("ui.admin.groups.members.table.remove", "제거")}
+                        {t("ui.admin.groups.members.table.actions", "관리")}
                       </TableHead>
                     </TableRow>
                   </TableHeader>
@@ -590,19 +644,44 @@ function TenantGroupsPage() {
                           {user.email}
                         </TableCell>
                         <TableCell className="text-right">
-                          <Button
-                            variant="ghost"
-                            size="sm"
-                            onClick={() =>
-                              removeMemberMutation.mutate({
-                                groupId: currentGroup.id,
-                                userId: user.id,
-                              })
-                            }
-                            disabled={removeMemberMutation.isPending}
-                          >
-                            <UserMinus size={14} className="text-destructive" />
-                          </Button>
+                          <div className="flex justify-end gap-1">
+                            <Button
+                              variant="ghost"
+                              size="sm"
+                              onClick={() => {
+                                setMemberActionTargetUserId(user.id);
+                                setIsMoveMemberModalOpen(true);
+                              }}
+                              disabled={moveMemberMutation.isPending}
+                              title={t("ui.common.move", "이동")}
+                            >
+                              <ArrowRightLeft size={14} className="text-primary" />
+                            </Button>
+                            <Button
+                              variant="ghost"
+                              size="sm"
+                              onClick={() => {
+                                if (
+                                  window.confirm(
+                                    t(
+                                      "msg.admin.groups.members.remove_confirm",
+                                      "'{{name}}' 님을 이 그룹에서 제외하시겠습니까?",
+                                      { name: user.name },
+                                    ),
+                                  )
+                                ) {
+                                  removeMemberMutation.mutate({
+                                    groupId: currentGroup.id,
+                                    userId: user.id,
+                                  });
+                                }
+                              }}
+                              disabled={removeMemberMutation.isPending}
+                              title={t("ui.common.remove", "제거")}
+                            >
+                              <UserMinus size={14} className="text-destructive" />
+                            </Button>
+                          </div>
                         </TableCell>
                       </TableRow>
                     ))}
@@ -610,11 +689,205 @@ function TenantGroupsPage() {
                 </Table>
               </div>
             </div>
-          </CardContent>
-        </Card>
-      )}
-    </div>
-  );
-}
+            </CardContent>
+            </Card>
+            )}
+            </div>
 
-export default TenantGroupsPage;
+            {/* Add Member Modal */}
+            <Dialog
+            open={isAddMemberModalOpen}
+            onOpenChange={(val) => {
+            setIsAddMemberModalOpen(val);
+            if (!val) setUserSearchTerm("");
+            }}
+            >
+            <DialogContent className="max-w-md">
+            <DialogHeader>
+            <DialogTitle>
+            {t("ui.admin.groups.members.add_modal_title", "그룹에 멤버 추가")}
+            </DialogTitle>
+            <DialogDescription>
+            {t(
+              "msg.admin.groups.members.add_modal_desc",
+              "이 테넌트에 속한 사용자 중 추가할 멤버를 검색하여 선택하세요.",
+            )}
+            </DialogDescription>
+            </DialogHeader>
+            <div className="space-y-4 py-4">
+            <div className="relative">
+            <Search className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
+            <Input
+              placeholder={t("ui.common.search", "검색...")}
+              className="pl-9 h-9"
+              value={userSearchTerm}
+              onChange={(e) => setUserSearchTerm(e.target.value)}
+            />
+            </div>
+            <ScrollArea className="h-[250px] rounded-md border p-2">
+            <div className="space-y-1">
+              {usersQuery.isLoading ? (
+                <div className="p-4 text-center text-sm text-muted-foreground">
+                  {t("ui.common.loading", "로딩 중...")}
+                </div>
+              ) : (
+                users
+                  .filter((u) => {
+                    const term = userSearchTerm.toLowerCase();
+                    return (
+                      u.name.toLowerCase().includes(term) ||
+                      u.email.toLowerCase().includes(term)
+                    );
+                  })
+                  .filter(
+                    (u) =>
+                      !currentGroup?.members?.some((m) => m.id === u.id),
+                  ) // Exclude existing members
+                  .map((user) => (
+                    <div
+                      key={user.id}
+                      className="flex items-center justify-between rounded-lg px-3 py-2 text-sm transition hover:bg-muted"
+                    >
+                      <div>
+                        <p className="font-medium">{user.name}</p>
+                        <p className="text-xs text-muted-foreground">
+                          {user.email}
+                        </p>
+                      </div>
+                      <Button
+                        size="sm"
+                        variant="secondary"
+                        onClick={() => {
+                          if (currentGroup) {
+                            addMemberMutation.mutate({
+                              groupId: currentGroup.id,
+                              userId: user.id,
+                            });
+                          }
+                        }}
+                        disabled={addMemberMutation.isPending}
+                      >
+                        {t("ui.common.add", "추가")}
+                      </Button>
+                    </div>
+                  ))
+              )}
+              {users.length > 0 &&
+                users.filter(
+                  (u) => !currentGroup?.members?.some((m) => m.id === u.id),
+                ).length === 0 && (
+                  <div className="p-4 text-center text-sm text-muted-foreground">
+                    {t("msg.admin.groups.members.all_added", "모든 테넌트 멤버가 이미 이 그룹에 속해 있습니다.")}
+                  </div>
+                )}
+            </div>
+            </ScrollArea>
+            </div>
+            <DialogFooter>
+            <Button
+            variant="outline"
+            onClick={() => setIsAddMemberModalOpen(false)}
+            >
+            {t("ui.common.close", "닫기")}
+            </Button>
+            </DialogFooter>
+            </DialogContent>
+            </Dialog>
+
+            {/* Move Member Modal */}
+            <Dialog
+            open={isMoveMemberModalOpen}
+            onOpenChange={(val) => {
+            setIsMoveMemberModalOpen(val);
+            if (!val) {
+            setMemberActionTargetUserId(null);
+            setGroupSearchTerm("");
+            }
+            }}
+            >
+            <DialogContent className="max-w-md">
+            <DialogHeader>
+            <DialogTitle>
+            {t("ui.admin.groups.members.move_modal_title", "부서 이동")}
+            </DialogTitle>
+            <DialogDescription>
+            {t(
+              "msg.admin.groups.members.move_modal_desc",
+              "선택한 멤버를 이동할 대상 그룹을 선택하세요.",
+            )}
+            </DialogDescription>
+            </DialogHeader>
+            <div className="space-y-4 py-4">
+            <div className="relative">
+            <Search className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
+            <Input
+              placeholder={t("ui.common.search_group", "그룹 검색...")}
+              className="pl-9 h-9"
+              value={groupSearchTerm}
+              onChange={(e) => setGroupSearchTerm(e.target.value)}
+            />
+            </div>
+            <ScrollArea className="h-[250px] rounded-md border p-2">
+            <div className="space-y-1">
+              {groupsQuery.isLoading ? (
+                <div className="p-4 text-center text-sm text-muted-foreground">
+                  {t("ui.common.loading", "로딩 중...")}
+                </div>
+              ) : groupsQuery.data && groupsQuery.data.length > 0 ? (
+                groupsQuery.data
+                  .filter((g) =>
+                    g.name
+                      .toLowerCase()
+                      .includes(groupSearchTerm.toLowerCase()),
+                  )
+                  .filter((g) => g.id !== currentGroup?.id) // Exclude current group
+                  .map((group) => (
+                    <div
+                      key={group.id}
+                      className="flex items-center justify-between rounded-lg px-3 py-2 text-sm transition hover:bg-muted"
+                    >
+                      <div className="flex items-center gap-2">
+                        <Users size={14} className="text-muted-foreground" />
+                        <span className="font-medium">{group.name}</span>
+                      </div>
+                      <Button
+                        size="sm"
+                        variant="outline"
+                        onClick={() => {
+                          if (currentGroup && memberActionTargetUserId) {
+                            moveMemberMutation.mutate({
+                              sourceGroupId: currentGroup.id,
+                              targetGroupId: group.id,
+                              userId: memberActionTargetUserId,
+                            });
+                          }
+                        }}
+                        disabled={moveMemberMutation.isPending}
+                      >
+                        {t("ui.common.move", "이동")}
+                      </Button>
+                    </div>
+                  ))
+              ) : (
+                <div className="p-4 text-center text-sm text-muted-foreground">
+                  {t("msg.admin.groups.list.no_results", "그룹이 없습니다.")}
+                </div>
+              )}
+            </div>
+            </ScrollArea>
+            </div>
+            <DialogFooter>
+            <Button
+            variant="outline"
+            onClick={() => setIsMoveMemberModalOpen(false)}
+            >
+            {t("ui.common.cancel", "취소")}
+            </Button>
+            </DialogFooter>
+            </DialogContent>
+            </Dialog>
+            </>
+            );
+            }
+
+            export default TenantGroupsPage;