Oscar Jyles Dyett, 25, had previously pleaded guilty to three charges of trafficking in a controlled substance and was convicted and sentenced by Justice Michael Brett last week.

The judge said Dyett's crimes were serious although at the "lower end", and factored in his "extraordinarily difficult" upbringing which resulted in drug use from a young age, and autism spectrum disorder diagnosis.

Justice Brett told the court Dyett was selling drugs from his grandmother's home at Turners Beach between February and August 2019, which was the basis of the first count.

"During that time, you sold illegal drugs, in particular cannabis, methylamphetamine and MDMA to end users in deal sized quantities on a regular and frequent basis," the judge said.

"This was a commercial profit-making enterprise."

The judge clarified Dyett's grandmother had no involvement in his drug trafficking.

"It was part of your methodology to leave stores of drugs in bushland near the house and some of this was found by police officers and a neighbour," Justice Brett said.

"For example, on 4 April 2019 a neighbour found 197 tablets of MDMA. On 18 April 2019, police officers located a bag containing 38.09 g of methylamphetamine, as well as other drug paraphernalia consistent with trafficking activity.

"Neighbours have reported frequent visits to the house, obviously by purchasers, throughout the period of the crime, and between March and May 2019, police intercepted a number of persons who had purchased drugs from you as they left the house."

Justice Brett said Dyett's operation in that time totaled tens of thousands of dollars worth of drugs, though the precise amount was "impossible" to quantify.

The judge said Dyett was remanded in custody following a search in August 2019 and then released on bail in May 2020, and soon after resumed selling methylamphetamine and MDMA which police discovered in August 2020.

Justice Brett activated a previously suspended sentence and imposed a further jail term, resulting in a three years, 11 month total sentence.

However, he backdated that sentence to account for the 23 months Dyett had already served and ordered he be eligible for parole after 24 months on October 18, 2021.