Sonic Weapons have been developed by many sides.
the Adeptus Mechanicus had a giant Mega tank/building on tracks known as an Ordantus (there were many of them) that carried a "Sonic Disruptor" that could level Ciys and entire armored companys.
I created a Leman Russ weapon system with it in mind and created the Sonic Cannon Leman Russ (Demolisher) known as "The Shatterer" (in honor of the C&C unit of the same name)
The Imperium otherwise no longer uses Sonic Weapons (that im aware of)
Chaos uses them in Noise marines of course and Deamons have them in forms that have been mentioned above.
Eldar have them (as mentioned)
its possible that Dark Eldar have them (but i have not checked, but i wouldn't put it past them)
Tau could develop them but they just havn't had the initiative to do so.
Ork...... well...... if they get a sub woofer (and a big one at that) and really belive it to work.......
Necrons don't need them but could make them on a whim with their advanced tech.