The 29-year-old versatile full-back has agreed a three-year contract at the Stadium of Light after the two clubs agreed an undisclosed fee for the player.
Chimbonda, who moved to White Hart Lane from Wigan for £4.5m in August 2006, becomes the sec
ond Spurs player to move to Wearside following Teemu Tainio's switch three days ago.
Keane believes Chimbonda, who was a non-playing member of France's 2006 World Cup squad, will be a useful addition.
"He'll give us more options at the back, creating more competition for places there, so all-in-all it is a fantastic signing for us," he told said.
"Pascal is one of those rare players who can play anywhere across the back line and that will be invaluable to us, so naturally we are very pleased to secure his services.
"He has a lot of Premier League experience which can only be a plus for us."
Chimbonda, who has been capped once by France against Denmark in May 2006, made 97 appearances for Tottenham.
The deal for Chimbonda is the second part of Keane's quadruple swoop on Juande Ramos' squad which is set to cost the club a total of around £16million in transfer fees.
Keane is now awaiting an answer from defender Younes Kaboul who is also attracting interest from Aston Villa and Portsmouth.
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