"I'm very disappointed in Andre and Tom," Brady said. "We have high standards and expectations for members of our men's basketball program, and they will be accountable for their actions."
Nation led the Dukes with 15.4 points and 5.3 assists last season, while Vodanovich averaged 4.1 points and 4.1 rebounds as the team went 11-20 (6-10 CAA).
Nation was also suspended the first 15 games of last season for violating athletic department policy.
James Madison hosts Virginia on Nov. 14 to open the season.