Forbes, 22, has previously played for The Colemen before his move to Northern Premier League East side Newcastle Town in the 2018/19 season.
The dynamic midfielder was most recently at AFC Bridgnorth who play in the Midland Football League.
Forbes played a role in the Meadow Men's fight for survival last season, finishing in 14th place which was enough to secure safety in 2022/23 Midlands Football League Division 1.
Beginning his career at Walsall, Forbes has also featured for Kidderminster Harriers, Chelmsley Town and Brocton.
Forbes scored a goal in Coleshill's pre-season friendly against Barwell FC which ended 3-3.
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