The 24-year-old right-back was a key part of the Belgium side which reached the quarter-finals of Euro 2016 and, just two days after the Rode Duivels' elimination at the hands of Wales, he has become the third signing PSG have made this summer after Grzegorz Krychowiak and Hatem Ben Arfa.
After five years with Club Brugge, the defender has penned a four year deal with the French champions and spoke of his delight at completing the move.
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“I am very honored to have been chosen by Paris Saint-Germain to come and bolster a squad that already features a number of great players,” he told the club's official website.
"I signed for PSG because I have a huge desire to keep improving, experience at the highest level and win titles. I can’t wait to play in the fantastic Parc des Princes stadium."
Club owner Nasser Al-Khelaifi, meanwhile, revealed his side fought off competition from other sides to land the signing.
“Thomas drew a large interest from many of Europe’s top clubs, resulting from winning the Belgian championship this past season as well as playing with the Belgian national team," he said.
"He has made the strong choice of joining Paris Saint-Germain, a club with whom he will now share his great ambitions."