diff --git a/simtong-domain/src/main/kotlin/team/comit/simtong/domain/auth/model/AuthCode.kt b/simtong-domain/src/main/kotlin/team/comit/simtong/domain/auth/model/AuthCode.kt
new file mode 100644
index 00000000..e97f95a9
--- /dev/null
+++ b/simtong-domain/src/main/kotlin/team/comit/simtong/domain/auth/model/AuthCode.kt
@@ -0,0 +1,26 @@
+package team.comit.simtong.domain.auth.model
+
+import team.comit.simtong.global.annotation.Aggregate
+
+/**
+ *
+ * AuthCodeAggregate Root를 담당하는 AuthCode
+ *
+ * @author Chokyunghyeon
+ * @date 2022/09/24
+ * @version 1.0.0
+ **/
+@Aggregate
+class AuthCode(
+    val key: String,
+
+    val code: String,
+
+    val expirationTime: Int
+) {
+
+    companion object {
+        const val EXPIRED = 180
+    }
+
+}
\ No newline at end of file
diff --git a/simtong-domain/src/main/kotlin/team/comit/simtong/domain/auth/model/AuthCodeLimit.kt b/simtong-domain/src/main/kotlin/team/comit/simtong/domain/auth/model/AuthCodeLimit.kt
index dbc46240..6e9f65e1 100644
--- a/simtong-domain/src/main/kotlin/team/comit/simtong/domain/auth/model/AuthCodeLimit.kt
+++ b/simtong-domain/src/main/kotlin/team/comit/simtong/domain/auth/model/AuthCodeLimit.kt
@@ -4,7 +4,7 @@ import team.comit.simtong.global.annotation.Aggregate
 
 /**
  *
- * AuthCodeLimit Aggregate Root를 담당하는 AuthCodeLimit
+ * AuthCodeLimitAggregate Root를 담당하는 AuthCodeLimit
  *
  * @author Chokyunghyeon
  * @author kimbeomjin
@@ -20,4 +20,21 @@ class AuthCodeLimit(
     val attemptCount: Short,
 
     val isVerified: Boolean
-)
\ No newline at end of file
+) {
+
+    companion object {
+        const val EXPIRED = 1800
+        const val MAX_ATTEMPT_COUNT = 5
+        const val VERIFIED_EXPIRED = 2700
+    }
+
+    fun sendAuthCode(): AuthCodeLimit {
+        return AuthCodeLimit(
+            key = key,
+            expirationTime = expirationTime,
+            attemptCount = attemptCount.inc(),
+            isVerified = false
+        )
+    }
+
+}
\ No newline at end of file