The five year contract was secured in conjunction with IT consulting company Capiotech and is valued at $13 million.
Under the terms of the contract, ASG and Capiotech will provide application managed services to support the airline's financial reporting and planning applications.
The project will be managed and delivered out of ASG's Northern Region operation based in Sydney.
ASG has worked with Qantas on previous IT projects. In 2006, ASG's Northern office was contracted to provide IT systems integration and management services to support the airlines' eQ Finance project.
Murray Rosa chief officer - sales & strategic operations, said the joint win was a significant achievement for ASG and its partner Capiotech.
"After working with Qantas for the past 30 months we're happy to be selected to work with this customer again," he said.
"We look forward to working with Capiotech and successfully delivering this project for our client."
Rosa added that ASG's contract pipeline remained strong and the company was confident of further success in the near future.