St. Francis Xavier's High School was founded on 21 May 1937 by Mr Miguel Antonio de Souza[1] in Corlim, Mapusa.

The Siolim Fransalian Education Society of the Missionaries of St. Francis de Sales (MSFS) manage the school.

In May 1950, Mr Miguel Antonio de Souza brought his school from Mapusa to Bamonvaddo, Siolim and set it up in a large private house.

As Mr Souza's health became worse, it was his wish that someday after his demise the SFX School should be donated to the Archdiocese of Goa.

After his demise, his son Francisco Sanches de Souza was appointed temporarily as the Principal and in December 1953, SFX School was handed over to the Archdiocese of Goa by the founder's wife.

Catarino Roberto Fernandes, of Bamonvaddo, Siolim, as the principal, and on 1 June 1965, the Bishop Raul Gonsalves, the Patriarch of the East Indies, asked Fr.

Filipe Neri Mendonca, to hand over the SFX to the Missionaries of St. Francis de Sales (MSFS) or “Fransalians”, and Fr.

Arminz Nazareth, MSFS, acting provincial of the Missionaries of St Francis de Sales, Maharashtra-Goa Province, presided over the inaugural ceremony.

At Bamonvaddo, Siolim, several attempts were made to run an English medium school for the education of the local youth.

Samson Joao Carvalho – conducted a private school in his own house at Bamonvaddo for several years, but had to shut it down for lack of continuity.