After retiring as a player, Collacchioni started a career as a coach in the amateur leagues of Tuscany.
[6] On 12 July 2022, he was unveiled as the new head coach of Livorno, originally scheduled to play Eccellenza but later readmitted to Serie D.[7] On 31 October 2022, Collacchioni was dismissed following a 0–1 league defeat to Montespaccato,[8] only to be called back one day later following a formal request by the team squad.
[10] On 1 June 2023, Collacchioni was unveiled as the new head coach of San Donato Tavarnelle for the club's upcoming Serie D campaign.
[11] Despite the club's ambitions to fight to return to Serie C after having been relegated the previous season, he failed in guiding San Donato into the top positions in the league table, and was ultimately dismissed on 19 February 2024.
[12] On 5 November 2024, Collacchioni joined fellow Serie D club Pistoiese as assistant to new head coach Alberto Villa.