A statement from the company quoted South Australian Premier Steven Marshall as saying this was a major win for the state.
"Investments like this will be critical to kick start our economy following the impact of COVID-19," Marshall said.
The new hobs will be aimed at providing essential services for Datacom's government clients and some customer support services for private sector clients.
"At Modbury, we offer opportunities to not only those who were previously unemployed but also for others looking to enter into a new career in an industry that is growing and evolving rapidly," he said.
The Modbury centre employs about 1200 and offers a broad range of IT and customer support services. Many of those who took up jobs were untrained and underwent significant training to set them up for a career at the company.
Said Tomasoni: "With the new centre at Noarlunga we will continue to work alongside our clients and partners to ensure we can offer employment opportunities for those who need them while maintaining our high standards of support for our customers."