The regulations stipulate that business persons providing services across the borders of SADC are allowed multiple entry, provided they can produce a certificate of negative COVID-19 test result not older than 72 hours from the time of departure. This certificate is valid for 14 days.
This regulation appears to be written for travellers from SADC initially entering SA (therefore needing a 72 hour PCR test on arrival), and then being permitted to depart and re-enter (multiple times) on the same test for up to 14 days. However, it should likewise apply for South Africans exiting and re-entering from SADC on the same COVID-19 test (not older than 14 days from the time of departure).
It is our understanding that this does not currently apply to leisure travellers within the SADC.