Mr Tonge will take on his new role in April 2025, bringing with him a wealth of experience and enthusiasm for the sport.
He is joining Haydock Park from Bath Racecourse, where he has been executive director since 2022.
He will be taking over from Molly Day, who has left to pursue a new opportunity in the USA.
Mr Tonge said: “I am thrilled to be joining Haydock Park Racecourse, a venue that holds such a prestigious place in the racing calendar.
“The opportunity to work at a course that hosts both a Grade 1 fixture over jumps and a Group 1 fixture on the flat is incredibly exciting.
“I look forward to collaborating with the talented team here to continue building on its fantastic reputation.”
Dickon White, regional director at The Jockey Club, said: “We are delighted to welcome Simon to the team at Haydock Park.
“His leadership and experience make him the ideal person for this role.
“April is the perfect time for Simon to join us, as it allows him to settle in just ahead of our busy summer season.
“We’re confident that he will make a significant contribution to the racecourse’s ongoing success.
“I would also like to take this opportunity to thank Molly for her dedication and hard work over the years, in her roles at both Haydock Park and Carlisle Racecourses.
“She has been an integral part of the team, and we wish her every success in her future endeavours.”