In-home care services for the elderly and some disability services are to be outsourced to the private sector by the South Australian Government, but a union has raised the prospect unscrupulous providers might rort the system.

The National Disability Insurance Scheme (NDIS) and changes to federal funding for aged care make the areas best suited to the private sector, the Government said.

About 380 staff and 6,000 clients in the domiciliary care area are expected to be affected by the changes, along with about 700 staff and 10,000 clients in disability services.

South Australia's Minister for Ageing Zoe Bettison said current staff would not lose their jobs.

"My expectation is you will take a choice of two things — to continue with your client and transfer to the non-government organisation who will continue these services," she said.

"If you choose not to do that and remain within the public sector, we'll support you with intensive case management and prioritisation to get a job in the public sector."

Smooth transition to private sector promised by Government

Dignity Party MLC Kelly Vincent criticised the planned changes, saying the focus needed to be on helping people with disabilities get independent advice about their best options for future care.

"It's really important that we centre the support around them so they can be informed about what their options are and assert their rights with objective support," she said.

Minister for Disabilities Leesa Vlahos said the Government would ensure there was a smooth transition for both clients and current public sector staff.

"We're making sure, whether people live in remote or regional South Australia or in Adelaide, we'll be working side by side with our existing clients and consumers as we transition into this new landscape," she said.

But Public Service Association secretary Nev Kitchen said he had grave concerns the changes might let any unscrupulous providers rort the system.

"People who are in private enterprise or being outsourced, they are not subject to the same rigour as people in the public sector who are, of course, covered under a code of ethics," he said.

"Sadly, there will be examples in the future where fraud takes place."

Mr Kitchen said his negotiations with the State Government had left him confident all the current public sector staff would be redeployed.