While polarization is a wave phenomenon, it only can occur for transverse waves. Therefore, sound waves (being longitudinal) cannot be polarized.
Polarization is defined by the Barron's Review Course Series: Physics (2004, Barron's Educational Series, Inc.) as "a process that produces transverse waves that vibrate in only one plane". What does that mean? Good question. Basically, polarization is when a transverse wave passes through two planes, each oriented at a different angle. No wave can pass completely unobstructed through both planes; they will dim the amount of light passing through as the planes are rotated in opposite directions.