The aim of the Founding Fathers of the School is four fold:
1. To provide a sound secondary education together with moral and religious training for mainly boys whose parents could not afford the fees for a boarding school.
2. To provide holistic and quality secondary education aimed at equipping students with tools and skills that will help them develop their individual talents and potentials.
3. To inculcate in students the appreciation and practice of moral uprightness and gospel values as espoused by the Catholic tradition.
4. To provide a school environment and experiences which will impart sound psychological balance and respect for social / cultural imperatives.
The St. Thomas Aquinas Senior High School is located at Cantonments & Osu in Accra.