One can salt CO2 out of solution by adding salt to carbonated water. Can one do the reverse? If one adds more and more CO2 to the water under pressure, can you drive out the salt?
NaCl is vastly more soluble than carbon dioxide, so this method won't work. You can get some NaCl to precipitate (assuming you have a concentrated solution) by bubbling HCl in, thanks to the common-ion effect, so you could for example get pure NaCl from rock salt this way. But somehow I don't think that's the situation you have in mind :-)