The school campus is situated above Sikkim Transport Bus Terminus and below the High Court of Sikkim. St. Thomas School and St. Thomas church are situated in the same building by the side of the main road. The school land was given to Fr Joseph Kunnath by the Sikkim Urban Development and Housing department. The school was established on 1st January 1982. It is a co-educational primary school. Fr Paul Kabo, the Director and Sr Regina Fidelis, the Principal, take care of the education of 773 students with help of 25 Teachers and 13 non-teaching staff.