Transfer from terminal 3 to terminal 2, Capital Airport?

There are free shuttle buses between the terminals and you can commute between in 15min.

It seems there is no message spa within the building of T2, but I know there is a Le Spa in T3, located at Gate 28, Domestic Departure Waiting Area. You may go for a try. Anther choice is the Hilton Hotel SPA, which is within walking distance to T3.