The history of St. Sebastian’s College can be traced beyond 160 years. However, the recorded history counts from the year 1926 after the De la Salle Brothers took over the administration of the school. Only five years later, the inaugural meeting of the Old Boys’ Association was held on 14th July 1931 with Rev Bro. Bonaventure Idus as the President, Mr. Peter. B. Dias as Hony. Secretary and Rev. Bro Joseph Charles as the Hony. Treasurer with a committee to manage the affairs of the Association.

Over a period of 55 years the Administrator of the school functioned as Ex-Officio President, while the Hony. Secretary functioned as The Chief Executive Officer of the OBA.