Example S3 bucket polices VPC endpoint

https://docs.aws.amazon.com/AmazonS3/latest/userguide/example-bucket-policies-vpc-endpoint.html

Example Restricting access to a specific VPC enpoint

{
   "Version": "2012-10-17",
   "Id": "Policy1415115909152",
   "Statement": [
     {
       "Sid": "Access-to-specific-VPCE-only",
       "Principal": "*",
       "Action": "s3:*",
       "Effect": "Deny",
       "Resource": ["arn:aws:s3:::awsexamplebucket1",
                    "arn:aws:s3:::awsexamplebucket1/*"],
       "Condition": {
         "StringNotEquals": {
           "aws:SourceVpce": "vpce-1a2b3c4d"
         }
       }
     }
   ]
}

Example Restricting access to a specific VPC

{
   "Version": "2012-10-17",
   "Id": "Policy1415115909153",
   "Statement": [
     {
       "Sid": "Access-to-specific-VPC-only",
       "Principal": "*",
       "Action": "s3:*",
       "Effect": "Deny",
       "Resource": ["arn:aws:s3:::awsexamplebucket1",
                    "arn:aws:s3:::awsexamplebucket1/*"],
       "Condition": {
         "StringNotEquals": {
           "aws:SourceVpc": "vpc-111bbb22"
         }
       }
     }
   ]
}