 Coleman was added to the Munster inter-provincial team as sub-goalkeeper to Séamus Durack in advance of the 1975 Railway Cup and was an unused substitute when the team suffered a 2-09 to 1-11 defeat by Leinster in that year's final.He again served as understudy to Durack the following year, but claimed his first Railway Cup medal after one-point victory over Leinster in the final.After losing the 1977 Railway Cup final to Leinster, Coleman claimed a second winners' medal as a non-playing substitute following a 0-20 to 1-11 victory over Connacht in 1978.