Barbados-born Simmons – who joined Warwickshire’s Academy in 2021 – has agreed an additional two years to his current deal.
It means the 20-year-old will stay at Edgbaston until at least the end of the 2026 season.
Simmons enjoyed a blistering Bears debut in the County Championship at Essex in May when he took five wickets in the match, including 3/12 off seven overs in the first innings.
Warwickshire Performance Director Gavin Larsen said Simmons has the talent to go to the very top of the game.
“It’s fantastic to have Che on board as a Bear for the longer term,” added Larsen.
“His batting also continues to develop and he has the ability to score important middle to lower order runs.
“He has the potential to really make a mark with Warwickshire over coming seasons and I look forward to seeing him progress.”
Simmons represented Barbados up to Under-19s level before moving to the UK as a 17-year-old.
He first came to prominence by claiming all 10 wickets in an innings while playing for the Franklyn Stephenson Academy, finishing with figures of 10/16 from 5.3 overs.
Simmons said: “Signing a contract with Warwickshire was a very proud moment for me and my family. I made the decision to come over (from Barbados) when I was 17. We didn’t know which way it was going to go, but we knew it was the right decision.
“My bowling skills have come a long way since I joined. Whether it be learning to swing the ball or wobble it back in, ways to outsmart a batter. There’s a lot of knowledge in the dressing room, players like Hannon-Dalby and Rushworth, it’s good to be around those guys and learn from them.
“Next few years I want to become a regular member of the first team, contribute to winning games and hopefully to win trophies.”