The short answer is: NO!
The real answer I want to give, but I know it's not proper etiquette: Are you kidding me? You can't be that dumb.
The long answer: Unless you are a hardware genius (and I mean circuits and chips and stuff genius) then you won't be able to rip out the hardware guts of a T-mobile phone and do some precise soldering back into the EVO (minus whatever cuts into the EVO case you are going to have to do to make room for the extra hardware).
I'm a T-mobile customer, so I hate to leave them, but this phone is just soooo sexy. T-mobile (using GSM technology) and Sprint (using CDMA) is like Windows and Linux: Two completely different technologies that are not compatible. It has to do with the cellular radio frequencies and technology. Like water and oil, these do not mix well. CDMA technology does NOT use sim cards. You are going to have to give up T-mobile and everything that comes with it.