A Victorian man caught earning more than $30,000 working as a driver and security guard while racking up workers' compensation payments has been fined and ordered to repay almost $50,000.

Earlier this month, Mohammad Naieem pleaded guilty in the Broadmeadows Magistrates' Court to a single charge of fraudulently obtaining payments. He was fined $5000 and ordered to pay $1000 in costs.

The court heard Mr Naieem received weekly compensation payments after he injured his back while employed as a machinist at a furniture manufacturer in 2017.

While accepting benefits, he earned more than $30,000 as a ride-share driver and a security guard until the fraud was uncovered a year later.

Mr Naieem repeatedly failed to disclose the work and received $48,664 in compensation during that time.

"This prosecution should serve as a warning that those tempted to cheat the system for their own benefit will be caught and face serious consequences,” WorkSafe's insurance business unit executive director Roger Arnold said.

Weekly payments are there to help workers who genuinely need support to recover from an injury and get back to work, and this type of dishonesty undermines the integrity of the scheme, Mr Arnold says.