Tasmania Police is treating the incident as suspicious.
Preliminary enquiries suggested the injuries the man sustained were not consistent with a hit and run crash.
An investigation is underway, and a post mortem will be conducted on Monday.
Police are appealing for people who may have seen cars or a man on Colebrook Road, north of Richmond, in the early hours of Sunday to come forward.
Police can be contacted on 131 44 or Crimestoppers anonymously on 1800 333 000 or crimestopperstas.com.au.
A man's body was found on the side of Colebrook Road at Richmond this morning.
Tasmania Police attended the scene about 5.50am due to a report of a "serious pedestrian accident".
Police are working to establish the circumstances of the man's death, and how he came to be in that location.
Colebrook Road is closed between Franklin Street and Fingerpost Road, and is not expected to reopen for some time.
Police are diverting traffic.
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