In 1911 when this school was registered as an assisted school, there were 325 students on roll. where Sri Sumangala College is presently located. When this failed, the management decided to shift the college to Nalluruwa. The first old boy of the college, Walter Salgado, donated the land for the main buildings and M. C. Fernando donated about to be used as the playground of the college. The funds for building the main hall of the building complex were donated by
Leo Fernando; physics, chemistry and biology laboratories were donated by P. C. H. Dias and the main building and the class rooms were built with public donations. All the classes from grade six upwards were taken to Nalluruwa new buildings on 7 August 1942. Grades 3, 4 and 5 were continued at the Rankoth Viharaya premises and it was popularly called town branch of the college. The principal or the head of this section was A. C. Morawaka who served the college until his retirement. With the transfer of the college to Nalluruwa it became one of the leading educational institutions where laboratory facilities were available for the students to do science subjects in the medium of English. Advance level students of the Sri Sumangala Girls School used the laboratories in the afternoons to do their practicals. The plot of land between the main college and the play ground was eventually acquired by the Education Department. In 1961 a large number of schools were taken over by the government and the town branch was registered as a separate school with a principal being appointed by the Education Department. A precedent was created to admit all the children who leave town branch after they passed the grade five test. In 1992 due to inclement weather the retaining wall of the Rankoth Viharaya collapsed damaging the main hall of the town branch. The school had to be kept closed for a few months. The Old Boys Association, parents and well wishers constructed 18 semi-permanent class rooms and the Town Branch was amalgamated to the main college. On 25 May 1993 the College was declared a National School by the Ministry of Education. On 26 December 2004 the
tsunami which destroyed the southern and eastern coastal areas damaged part of the semi-permanent buildings of the college. The
2004 Indian Ocean tsunami struck during a school vacation so no injuries were recorded. All together 182 schools were damaged by the
tsunami. Out of these damaged school the
government has decided to re-locate 98 schools including Sri Sumangala College. Donor partner JICA granted a Rs. 330 million loan to build a completely new school with all the modern facilities. It is a coincidence of fate that the Sri Sumangala College has to be moved to a location five decades later that the Board of Management had initially planned on in 1942, before finally settling for the site in Nalluruwa. ==Founders==