WATCH: Mitch Swepson Takes Two In Two Balls
Swepson and Wildermuth will travel with both Australia A's four-day and one-day squads, while Heazlett has been picked as a 50-over player only.
The selection is a just reward for the trio who had standout campaigns for the Heat in BBL|06.
Swepson proved to be one of the club's most effective bowlers, with the leg-spinner's season haul of 12 wickets seeing him picked in Australia's Test squad to tour India.
Likewise Wildermuth was a consistent performer with both bat and ball, scoring crucial runs in the Heat's middle order and claiming nine wickets, while Heazlett had a taste of life in the Australian green and gold after making his One-Day International debut against New Zealand in February.
Australia A will contest two four-day games against South Africa A and play tri-series against the hosts and India A.
Australia A tour of South Africa - Fixtures
12 July – 15 July: Australia A v South Africa A at Tukkies
19 July – 22 July: Australia A v South Africa A at Senwes Park
26 July: Australia A v India A at Tukkies
30 July: Australia A v South Africa A at Groenkloof
1 August: Australia A v India A at Tukkies
5 August: Australia A v South Africa A at Tukkies
8 August: Tri Series Final at Tukkies