Sandro joined Tottenham from Brazilian club Internacional last March and made an immediate impact, starring in midfield alongside Luka Modric towards the end of last season.
The Brazil international had been linked with Roma and Barcelona this summer but has confirmed that he sees his future at White Hart Lane by signing a new contract that will run until the summer of 2016.
Sandro was used sparingly by Tottenham manager Harry Redknapp after his arrival but became a fans' favourite last term thanks to his tough tackling and tireless work rate.
The 22-year-old played a major role in the club's Champions League last-16 victory over AC Milan and scored a spectacular goal against Chelsea at Stamford Bridge.
A knee injury suffered in the Copa America for Brazil this summer has kept him out of action this season and he is not expected to return for at least another month.
The Brazilian faces a tough fight to earn his place in the first team back when he returns.
Scott Parker, signed from West Ham on deadline day, operates in a similar manner to the youngster and Tom Huddlestone is nearing full fitness after struggling with a long-standing ankle injury.