The 27-year-old will officially become a Black Cats player in July when his contract with Manchester City expires.
Fellow keeper Vito Mannone earned numerous plaudits between the posts for Sunderland last term, but Pantilimon is confident that he can overhaul the Italian.
"It is very important for me to play every game and now I have found this solution," Pantilimon is quoted as saying by Sky Sports News.
"I want very much to return to the national team. To be first choice is very important to me, which is why I chose a club where I was wanted and where I had a chance to play. Mannone is a good keeper who played well in the previous season, but my goal is to earn a place."
Pantilimon made 29 appearances during his three-year stint at the Etihad Stadium.