A sanding device including a base plate, an evacuating tube, an articulated joint, and a sealing member. The base plate has a sanding surface and an opposite supporting surface, with an orifice extending therethrough for allowing the passage of particles sanded by the sanding surface. The evacuating tube has an inlet operatively connected to the supporting surface of the base plate, the inlet being positioned about the orifice of the base plate for receiving particles sanded by the sanding surface of the base plate, through the orifice thereof. The evacuating tube also has an outlet configured for operatively connecting to a vacuum system for evacuating sanded particles from the sanding surface through the orifice of the base plate via a suction effect provided by the vacuum system. The articulated joint is configured for operatively connecting the inlet of the evacuating tube to the supporting surface of the base plate, and has at least one pivot axis for enabling the evacuating tube to be articulated with respect to the base plate along various operating angles. The sealing member is operatively mounted onto the base plate for sealingly interconnecting the orifice of the base plate to the inlet of the evacuating tube. Also described is a sanding assembly provided with the above-mentioned sanding device.