A method for producing a panel sandwich (2, 17, 40) for use as a wall, ceiling or floor panel (1, 16) comprising at least the following steps: providing a base panel (7, 20, 31) made of wood-based material, arranging a sound-insulating layer (9, 18) above the base panel (7, 20, 31), arranging a cover panel (11, 22, 38) above the base panel (7, 20, 31), pressing the sandwich, wherein an elastic plastic material is used to produce the sound-insulating layer (9, 18), wherein according to a first alternative of the invention, a closed-cell foam (9a) is arranged as the elastic plastic material, wherein the plastic material before being introduced into the sandwich panel has an elasticity modulus under pressure of 0.25 MPa to 1.5 MPa, according to a second alternative of the invention, the elastic plastic material applied is a self-adhesive plastic material (18c) which connects the base panel (20) to the cover panel (22), is elastic when set, has an elasticity modulus under pressure of 0.25 MPa to 1.5 MPa and has a minimum thickness of 0.3 mm.