I use Session drummer for this as it very simple and as far as I know the only Sonar supplied drummer that can play any samples.
I make recordings of drums or sound effects. You can also just copy from the original drum audio files.
I load them into Wave lab to top and tail them so there is zero time at the start and then just enough tail to catch the important part of the tail end. You want them short.
Then I just copy those Wave files into Session drummers library.
Now I can load them up and play them no problem.
I sampled my drum kit and it was real spooky to play them with a midi track. I totally sounded the same as the audio track.