Separating a mixture of salt and sugar is actually quite easy. Athough sugar is soluble in any type of alcohol, salt on the other hand is not. If you want to separate the two, first mix both salt and sugar in any type of alcoholic beverage. Once you do that, if you now filter the beverage, you will be able to obtain the salt. However, since the sugar is soluble in alcohol, you need to obtain it in a different manner.
Once you have filtered the beverage and gotten the salt, evaporating the alcohol and sugar mixture will leave you with the sugar. After both filtering then evaporating, you will be left with the separation of sugar and salt that you started with.