From mid January next year Scott will assume the role of CFO for the coal miner.
Gloucester chief executive Rob Lord said Scott's experience in managing assets worth more than $A1 billion would be an incredible gain for the company.
"I am delighted to welcome Peter to the senior executive team at Gloucester Coal," Lord said.
"Peter has a diverse professional background and a range of public company experience. I look forward to working closely with him to execute Gloucester Coal's financial and business growth strategies."