Clark netted 26 points, and Sims added 24 and nine rebounds as the Hoyas (4-1) earned the fifth-prize prize at the Hawaii tourney.
Markel Starks and Hollis Thompson each added 12 points in Georgetown's win.
The Tigers (2-2) lost despite 22 points from Will Barton, and 20 points and six boards from Joe Jackson.
Martin Bashir resigns from MSNBC over Sarah Palin comments
Toddler uninjured after being knocked over by Obama family dog