Watson, a 6-foot-7 forward who appeared in 29 of the Cougars' 31 games this season, was declared academically ineligible for the fall semester and will transfer to a junior college rather than sit out during that time.
"We wish James nothing but the best," Wazzu coach Ken Bone said in a statement.
Here's the updated list to all the West Coast transfers from this offseason.
Arizona: D.J. Shumpert
Boise State: Tyler Young
BYU: Michael Loyd Jr.
Cal State Bakersfield: Marcus Hall
Loyola Marymount: Kevin Young
Nevada: London Giles
Pepperdine: Andy Shannon
Santa Clara: Troy Alexander
Weber State: Franklin Session