From 1652 to 1655 he was rector of the Irish College at Salamanca, and reader in the chair of controversy against heresy there; he was also professor of moral theology.
Rumours of his intended change were in circulation about the beginning of 1674, Sall believed his life to be in danger, and Price with others sent a mounted guard to bring him to the archiepiscopal palace.
On 17 May 1674 Sall made a public declaration of his adhesion to the church of England in St. John's Church, Cashel; he admitted that he would probably not have declared himself openly but for Arthur Capell, 1st Earl of Essex's proclamation ordering regular clergy to leave Ireland, based on the proceedings of the English parliament in January 1674.
In 1675 he was presented by the crown to the prebend of Swords in St. Patrick's, Dublin, and in 1676 he was made chancellor of Cashel; given Irish preferments, he was also domestic chaplain to the king.
One was by J. E. printed at Louvain, and dedicated to Mary of Modena; another was the Doleful Fall of Andrew Sall, by Nicholas French as N. N.; and a third by Ignatius Brown, a Jesuit, who as J. S. In answer Sall published his True Catholic and Apostolic Faith, which was licensed by the vice-chancellor on 23 June 1676, and printed at Oxford.
Sall worked over the Bedell manuscript with Paul Higgins (Pól Ó hUiginn), another convert, now at Trinity.
[2] Boyle did not follow all the advice from Sall, who thought Theobald Stapleton's Irish catechism of 1639 was a good model.
[2] By mid-February 1682 some sheets of the Old Testament were ready for the press, and before his death Sall had written a preface influenced by Jansenists.