The 20-year-old Pawtella man who died was a passenger in the vehicle.

Tasmanian Police said the crash happened around 4.30am on Sunday, August 18.

The 20-year-old male driver, from Richmond, was travelling east towards Tooms Lake and lost control of the white 2008 Ford Ranger utility while attempting to negotiate a right-hand curve, a Tasmania Police spokesperson said.

"As the driver lost control the vehicle rotated and rolled and, as a result, the male front-seat passenger was thrown from the vehicle," the spokesperson said.

"Initial investigations indicate that the use of alcohol and the failure to wear a properly fitted and adjusted seat belt are likely contributing factors in the males death."

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Ambulance Paramedics declared the passenger dead at the scene.

The male driver was taken to Royal Hobart Hospital by ambulance and is in a stable condition with minor injuries.

"Tasmania Police express their sincere condolences to the family and friends of the deceased," the spokesperson said.

Police, Tasmania Ambulance Service, Tasmania Fire Service and SES attended the scene.

Stonehouse Road was closed and traffic diverted until 9am as Police Forensic and Crash Investigation Services investigated the scene.

Anyone who saw the vehicle before the crash is asked to contact Senior Constable Adam Hall at Southern Crash Investigation Service on 6230 2111 or Crime Stoppers on 1800 333 000 or online at crimestopperstas.com.au