- Aeronautical Society
- Art Club
- Association of Innovation and Design
- Association of Science and Technology
- Automobile Club
- Buddhist Students’ Association
- Canto Perpetua Choir
- Carnatic Orchestra
- Classical Music Association
- Commerce Society
- Cubing Society
- Culinary Arts Society
- English Drama Society
- English Lit & Debating Society
- Gavel Club
- Geography Society
- Health Club
- Hewisi Band
- Hindu Students’ Union
- Histoarcheo Club
- HNB Students’ Savings Unit
- ICT Society
- Interact Club
- Islamic Society
- Junior English Lit & Debating Society
- Junior Maths Society
- Junior Science & Technology
- Kennel Club
- Media Unit
- Photographic Club
- Political Science Society
- Productive Citizenship Society
- Quiz Club
- Scuba Diving Unit
- Radio Club
- Red Cross Society
- Road Safety Patrol
- Senior Environmental Club
- Seylan Bank Students’ Savings Unit
- Sinhala Literary & Debating Society
- Society for Social Work & Welfare
- Spelling Union
- Student Christian Movement
- Tamil Drama Society
- Tamil Literary and Debating Society
- The Ternion
- Thomian Union
- United Nations Club
- Western Band
- Wildlife Society
Hewisi Band
The Hewisi Band of S. Thomas' College Mount Lavinia is one of the main activities in College. It has a proud reputation and fascinating history throughout the previous years. The objective of the College Hewisi Band is to uplift the standards of Sri Lankan traditional, oriental and contemporary music to the optimum level to give a taste of our culture to the younger generations. We as a band try to derive the hidden talents of our College students and to give out a fabulous output.Latest Project
Kailasa '19
The main event of the Hewisi Band is hosting its annual Hewisi Band concert along with the participation from invited schools. We always continue the traditions which were passed down from the previous Hewisi Bandsmen.