Prior to the opening of the school building in 1975, high school students in LaSalle were bused to General Amherst High School.
Sandwich Secondary has one of the best track and field complexes in southwestern Ontario. Officially named the Robert C. Carrick Memorial Track, it opened in 1993 at a cost of $1.70 million dollars and includes an 8-lane rubberized all weather track, field house, grandstand, football and soccer field, baseball diamond, track and field event area (shot-put, two discus circles, all weather javelin approach, all weather runways for long jump, triple jump, pole vault), and a concession stand. The complex was named after a police officer who was killed in the line of duty in 1968.
Its feeder schools, or family of elementary schools, are Sandwich West Public School, LaSalle Public School, Sacred Heart Roman Catholic School and Prince Andrew Public School.