In 2002, Roy started to play for the University of Washington (UW). He remained there for four years under head coach Lorenzo Romar. He majored in American Ethnic Studies. After his junior year, Roy considered entering the draft, but changed his mind when he learned that teammate Nate Robinson and high school senior and UW signee Martell Webster intended to enter the draft. He saw an opportunity to rise in the ranks on his college team, and improve his draft position.