He steps up after joining as Paul Doswell’s head coach back in December.
The 37-year-old replaces the U’s legend in the dug-out after he left the club after 11 seasons at Gander Green Lane.
Doswell took up the post at Havant & Waterlooville last week.
It is a new era at Sutton and chairman Bruce Elliott told the club’s website that fans should be excited about their new manager.
“Without even having to advertise the post we had a number of applications, from ex-Premier League players as well as both experienced and up-and-coming young managers in the Non-League game,” he said.
“But Matt greatly impressed the board with his desire and enthusiasm to take up the position, and his knowledge of the game and players at this level, as well as above and below it.
“He will bring new and fresh ideas, and the energy and enthusiasm which have been the hallmark of Sutton United for so many seasons now.
“Most of all he is an ambitious man who has been biding his time to make the right decision about which club he wants to manage – he appreciates what Sutton United is all about having been able to observe the club closely for five months now.
“We are all extremely excited about how Matt will continue the progress our club has made in the last eleven years.
“We have heard nothing but good things from those he has worked with in the past, and Paul Doswell, Ian Baird and the playing staff all speak very highly of his contribution since joining us in December.
“With that support from the dressing room, it gives us continuity at a time when we feel we need evolution rather than revolution.
“Matt is raring to go, as we all are, and we are looking forward to working with him and continuing to challenge in the Vanarama National League.’’