On the USA Carry map, SC is listed as a shall issue state which issues permits to non-residents. Further reading usually mentions that SC will issue to "qualified non-residents."
However, if you go to the SC state website, you will find just what the qualification is for non-residents. It is not qualification by background check, or by taking an
NRA course. SC means by a qualified non-resident this: a non-resident who owns property in South Carolina.
If you just want the permit, I guess that you could buy some scruffy, weed-covered lot in a low-cost area somewhere in SC. Or you might have a vacation home, or an investment farm. But the usual gun-owner wanting a permit just for vacation, or passing through, will not be considered "qualified."
I would suggest that the USA Carry map should be changed somehow to show that SC really does not easily issue permits to non-residents.