As of 2010 Notre Dame had 462 players drafted. USC (Southern California) was second with 461 drafted players
UCLA and Kentucky are tied with 109 players drafted into the NBA as of October 2014. The University of North Carolina has had 105 drafted. The school that has had the most players drafted in the 21st century is Kentucky, with 22.
You can get drafted into the NBA from Canada similarly to the way that players from the USA get drafted. Several players from Canada have played in the NBA such as Steve Nash, perhaps the most famous.
The University of Southern California with 11 players.
university of North Carolina
U of Southern Cal