I can think of at least two ways to do the separation:
1) Separate based on differential solubility in water, i.e., fractional crystallization. Glucose is much more soluble that salt, so the salt will crystallize first. In fact, carbohydrates can be quite difficult to crystallize, and you will eventually end up with a syrup that with seeding will give you almost pure sugar. That approach would apply best, if you had a solution of the mixture. However, you have a solid mixture; so,
2) My preferred method would be to separate the crystals based simply on their density. You need a liquid that is less dense than NaCl crystals and more dense than sucrose crystals, and in which neither dissolves. A mixture of hexane or any hydrocarbon with chloroform or carbon tetrachloride would work. There are numerous other non-aqueous mixtures one could use. I did look up the relative densities of the two crystals (who can remember those data anyway), and you need a liquid with a density between 1.59 and 2.16 g/mL. A mixture with a specific gravity of 1,7 or so would be great, which is easily done with hydrocarbons and halocarbons.
Finally, one could get quite complicated and separate the mixture based on differential solubility in dextran solutions or use specific ligands, such as boric acid. Melting the mixture probably cannot be used, because sucrose decomposes upon melting. But that would give you a way to recover the salt.
John
Edit: A quick check this morning shows that tetrachloroethylene (cleaning fluid) has a S.G. of 1.623, so it should work. Carbon tetrachloride and chloroform are not quite dense enough.