So if I understand want your boss wants to do is Site A is the originating site and Site B is where you are moving - he wants to build a new vSphere in environment in Site B connecting back to the SAN in Site A and then vmotion to Site B - is this what you boss is looking to do? If this is the case it actually is supported - do a search for Long Distance vMotion -
But th $64,000 question is if this a true datacenter migration than how does the data get moved? If this is a DR solution than its not a good one because vMotion is not intended for DR