St. Thomas More offers a variety of competitive sports for both boys and girls, including volleyball, soccer, football, basketball, baseball, cheerleading, Jr. Pep Squad and track and field. The athletic program falls under the jurisdiction of the school and is administered by the Principal, the Athletic Director, full and part-time coaches, and parent volunteers.
STM is a member of the Greater Houston Catholic Athletic Association (GHCAA), a competitive league. Usually, there are two to three practices and two games during the week.
Most sports require mandatory tryouts to select the teams. All students trying out need to have a physical (after June 1st each year) with completed and signed forms turned into the school nurse before they can try out.