I dont own a Sony laptop, however, if they 'follow' the standard of other laptop manufacturers, then the answer would be yes. It would be relatively simple to remove your old hard drive and replace it with one you might buy off from CompUSA or that of any other computer store.
I know that this was really short, but it isn't that hard either. Only thing is to figure out where the hard drive is located at. Normally, modern laptops has a hard drive tray that you can just remove a few screws and pull out.
Here's a link to something I found way back when...
Hope that this helps alittle and good luck.
Does anybody know the procedure for disassembly of a Sony PCG-TR5AP in order to replace a hard drive? Is's a standard swap of a new factory drive with a standard crashed drive.