A Queensland man has faced court on drug charges after police allegedly found $300,000 of cannabis in his car travelling in outback New South Wales.

The vehicle was pulled over about 4:40pm on Tuesday on the Barrier Highway near Wilcannia in the state's far west, and officers conducted a search.

Police said they found 30 kilograms of the drug in the boot, and arrested the 36-year-old driver, Benjamin Rigoni.

Detective Inspector Michael Fuller said it was not yet known where Rigoni, who comes from the Brisbane suburb of Keperra, was heading.

"He was the only person in the car, so investigations will still be ongoing in relation to where the drugs have come from, where he is going and those matters," he said.

Police said they also found $6,380 in cash during the search.

Rigoni was charged with supplying a commercial quantity of a prohibited drug and was taken into custody by police.

He did not apply for bail in Broken Hill Local Court on Wednesday morning and it was formally refused.

The case has been adjourned until January.

The Barrier Highway stretches across western NSW and into South Australia, and police regularly arrest suspected drug traffickers during patrols.

Detective Inspector Fuller said police in the region were trained to identify suspicious vehicles.

"It is a major highway; it does get us across South Australia and across our command," he said.

"People probably move a variety of things across but a lot of it is down to the great work of the police, getting out there and being able to interact and pick these things up."