Hi Marcus,
If you're talking about remixing as in "I want to change the drums to be louder" or "that guitar has to go", then no.
You're more than likely dealing with a two track that was recorded in.
Now, if your remix means doing something like a "mixtape", then yes. Sonar can help you with that.
You can cut and splice and rearrange (use the split tool and a couple of extra tracks).
There are a number of really good people here so they will help you with details.