Hamdan saw his first action at Winston Churchill High School in Potomac, MD as a backup quarterback. After his sophomore year, Hamdan transferred to Bishop Denis J. O'Connell High School in Arlington, Virginia. As the football team's starting quarterback, he led the Northern Virginia area in passing yards, becoming Virginia Independent Schools Player of the Year and earning first-team all-league and district honors. Hamdan also was a starting center for the school's basketball team and played baseball for the 15-and-under U.S. National Baseball team.