Best way of exporting audio tracks from sonar to other DAW and stay in sync

Export the clips as Broadcast WAV files, which time-stamps their position on the timeline. Make sure the other DAW is capable of importing Broadcast WAV files, then import them. 

 
I agree with Craig about exporting as Broadcast WAV files
However, I never like to send anything to a producer without a fail safe method.
So for me, it depends what kind of clip it is.
 
-If its a Midi clip: go to the very start of the project and place 1 note (preferably a 1/8 note)
then select the whole clip and choose "Bounce to clips". this will leave you with a track that starts at projects beginning. Assuring every track will line up in the future. 
(this 1/8 note will simply be deleted when imported in to new project/another daw.)  
 
-If its an Audio clip: A much easier method may be applied here.
Simply drag the beginning of the audio clip (using the smart tool=cursor turns blue) to the very beginning of the project and then choose "Bounce to clips". 
 
When I save projects, send projects to producers or engineer's for further editing, I like to have everything organized.
a method which is fail safe.
I also send a "Project notes" document with track listing, special notes, exc.
I also do other things but I wont get in to that (my Track naming process)
Also *Be Sure to: bounce your audio tracks down to just one clip.
You don't want to be sending little fragment's of clips, hoping he will figure out where they go.
(if broadcast doesn't work)
This can turn in to a mess and I have dealt with it first hand mixing other peoples projects.
if you have a track with 10 little clips in it. select the track\right click\bounce to clips.
Now all your little clips are 1 clip.
 
Good luck