Possible?

I know that it is possble to connect my midikeyboard to the mpc.
What i am wondering about is if it is possible to connect my midikeyboard with USB to reason and then midicables to the mpc and record the sounds from reason to the mpc?

Or do i need a soundmodule or a keyboard that already has sounds?

Yeah, you can. Alot of people do this with all different MPC models.
There's a topic in the MPC Studio Environments Forum with instructions on how to use Reason as a sound module.

You can also have a look at your MANUAL

You ll find anything you can ask yourself on it

i use a alesis IO2 as a daw to sample sounds from reason into my mpc. for that i connected the digital input.