The documentation for your audio interface indicates this interface seems to work just fine in ASIO driver mode.
I would suggest you list your current settings in Sonar for your Driver Mode, selected Audio Interface itself as a device, as well as the Record and Playback Timing Masters.
I have always had Sonar automatically fill in the values for the timing masters, as soon as I clicked Apply after changing driver mode to ASIO and having my audio interface selected as the audio interface device in Sonar.
Also, here is a link to I believe your current documentation for your audio interface:
http://cdn-data.motu.com/..._Hybrid_Manual_Win.pdf It looks like you want to read through Chapter 7, Configuring Host Audio Software, which begins on page 57.
So, bottom line - I believe this SHOULD be able to work using ASIO driver mode in Sonar.
Bob Bone