I'd ask myself this question: why do I need to migrate an EC2 instance to VMware?
This instance has probably some dependancies in AWS (EBS, S3, RDS...) so migrating only one component can be tricky.
So, if you are still convinced you need to do it, you have many ways to do it, but is this EC2 instance is a fresh EC2 instance or was it converted from VMware as well?
- using AWS import/export tool : VM Import/Export (works only if previously a VMware VM)
These conversion could be not 100% efficient, you have to figure out with network adapters, Re-IP, cold migration, dependancies with other components, etc...
Hope that helps