No, there isn't really a good way to do this in SONAR unless there's a CAL out there that I don't know about.
Assuming there isn't too much overlap of voices in the chord progression, you can drag in the keyboard at the left side of the PRV to select a pitch range, and Shift+drag it to another track. If there
is overlap, you may need to work in sections and/or selectively move some notes to the correct track to finish the job after making the initial split by ranges.
But I'm curious... what does Sibelius do when not all chords have the same number of notes?