Van Noy, who played all 69 defensive snaps in Thursday's season-opening 42-27 loss to the Kansas City Chiefs, was scheduled to become an unrestricted free agent after the 2017 season. The extension runs through the 2019 season.
"Obviously it's always good to get into a situation where a team wants you and believe in you," Van Noy said. "I'm just honored that Bill Belichick and [director of player personnel] Nick [Caserio] and Mr. Kraft have full belief in me. It's an honor. I'm really, really blessed."
Asked what has been a good fit for him in New England, the 26-year-old Van Noy said, "Everything. The atmosphere. The team. The coaches. I just fit pretty well with it. I'm happy to be a Patriot."
The 6-foot-3, 243-pound Van Noy entered the NFL as a second-round draft choice of the Detroit Lions in 2014. The Patriots acquired him on Oct. 26, 2016, along with a seventh-round draft choice, in exchange for a sixth-round pick.
Van Noy's versatility and athleticism has benefited the Patriots, as he primarily plays as an off-the-line linebacker but can also sometimes move down to the line of scrimmage in more of a pass-rushing role. He had six tackles in Thursday's loss.
In 2016, Van Noy played in 10 games (two starts) after the Patriots acquired him, totaling 27 tackles, one sack, one interception, one forced fumble and two special teams tackles. NFL Network first reported Van Noy's extension with the team.