diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/member/MemberService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/member/MemberService.kt
index 2c54085..b9f7b19 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/member/MemberService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/member/MemberService.kt
@@ -549,6 +549,7 @@ class MemberService(
 
         logoutAll(memberId = member.id!!)
         member.isActive = false
+        member.nickname = "deleted_${member.nickname}"
 
         val signOut = SignOut(reason = signOutRequest.reason)
         signOut.member = member
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt
index 53ce8de..e736e1b 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt
@@ -64,6 +64,7 @@ class AuthService(
     fun signOut(memberId: Long) {
         val member = memberRepository.findByIdOrNull(memberId) ?: throw SodaException("로그인 정보를 확인해주세요.")
         member.isActive = false
+        member.nickname = "deleted_${member.nickname}"
 
         val signOut = SignOut(reason = "운영정책을 위반하여 이용을 제한합니다.")
         signOut.member = member