Are you talking about the DOTM one? I believe G60Force I think it was did a digi-bash of that. Here it is;
Are you talking about the ROTF or DOTM Soundwave toy? If it's the ROTF Soundwave toy, then as Aernaroth said, they already came out with a blue repaint of ROTF Soundwave. But if you're talking about the DOTM Soundwave, his toys aren't even out yet... and I doubt we'll get a blue repaint of him, so probably what you're going to want to do is buy a DOTM Soundwave figure when he comes out and then commission one of the Radicons to repaint him blue.