Sandwich Secondary School is a school in LaSalle, Ontario. It has about 1,050 students, and teaches about half of the students in LaSalle, along with St. Thomas of Villanova Catholic Secondary School. Sandwich Secondary School is part of the Greater Essex County District School Board, or GECDSB. It was named after the former town of Sandwich, which used to encompass the western shores of Windsor, as well as LaSalle.