He was appointed chaplain of the St. Sebastian Church in Madeira Island in 1529, then moving to Lisbon and Porto.
After the death of the governor-general João de Castro, Sardinha returned to Portugal, studying Canon Law in Coimbra.
[1] In 1551, Pope Julius III established the Diocese of São Salvador, under the Papal bull Super specula militantis ecclesiae.
Sardinha was ordained a bishop by Dom Fernando de Menezes Coutinho e Vasconcellos, taking office on June 22, 1552.
On July 16, 1556, he and his crew were shipwrecked and captured by the Caeté people in the Captaincy of Pernambuco, a Portuguese administrative district that covered the region north of Bahia.