How To Write A Letter Of Resignation From Coaching . This coaching job resignation letter is suitable when you want to send a formal letter to inform an individual or team that you have to resign from the position as coach. This document has been certified by a professional. Assistant Coach Resignation Letter Templates at from www.allbusinesstemplates.com [company] as [title], effective as of [date two weeks from now]. We recommend downloading this file onto your computer. Carter, this letter is to inform you that i am resigning my position as assistant coach of the tornadoes effective immediately.