Jayawardene has responsibility for "overall strategic planning" in his new position, and will work with each of Mumbai's franchises alongside their coaches and support staff.
ESPNcricinfo understands that Jayawardene has not formally left his role in the Hundred, but he met virtually with Brave's management last week and explained that he is looking to move on as a result of his increased responsibilities with Mumbai. As a result, Brave are already exploring possible replacements, with Jayawardene expected to play a role in the handover process.
He coached Brave to the title in the inaugural season of the Hundred, but they struggled in 2022, finishing seventh in the eight-team tournament after their bowling attack was decimated by injury and unavailability.
Additional reporting by Nagraj Gollapudi