You need to be more specific as laptops are not really designed for those sorts of upgrades. Chances are there are only 3, maybe 4 different cards that will work...unless you can weld in a new chassis and modify the housing not to mention the motherboard.
If you post the exact model number of your laptop, it will be possible to determine if there are any cards out there you can use.
Sorry but it's a no go. The only way to upgrade the graphics on a laptop is to replace the motherboard and cooling assembly. Good ol Sony is known to have waaay too many different designs and models for their laptops, thus making replacement parts for their laptops more expensive than say HP who uses many common parts across different models.