A sandblasting apparatus for cutting a plate-shaped workpiece into a plurality of separate tablets includes a chamber defining a cavity, a support assembly received in the cavity, a sandblasting assembly for spraying sand toward the workpiece, a first mask located between the sandblasting assembly and the support assembly, a second mask located between the sandblasting assembly and the support assembly, and a mask switching member for selectively placing the first mask or the second mask over the workpiece. The support assembly is configured for supporting the workpiece and the tablets. The first mask cooperates with the sandblasting assembly to remove unwanted portions of the workpiece thus obtaining a tablet network consisting of a plurality of tablets and a plurality of connecting portions interconnected between the tablets. The second mask cooperates with the sandblasting assembly to remove the connecting portions of the tablet network thus obtaining a plurality of separated tablets.