In 1982, the Indoor Stadium was built during the tenure of Mr. S.L.A. Rathnayake. This building was later named as the S.L.A. Rathnayake Memorial Indoor Stadium.
The stadium has three indoor badminton courts and facilities for Table Tennis, Carrom and Chess with a seating capacity of approximately 1000 spectators.
Each year, the school hosts the "S L A Rathnayake Memorial - All Island Under 16 Badminton Team Championship" and attracts school children from all parts of the island.