There's no special entrance test for a sound engineering course in India. If you're looking for universities offering this course, then one among them is  IIT Kharagpur. That's the only IIT offering a course in sound engineering.Other options are:

• Film and Television Institute of India,Pune
• Cosmic Institution of Neo Entertainment, Media & Arts (CINEMA), Ghaziabad
• Zee Institute of Media Arts (ZIMA), Mumbai
• Shemaroo Institute of Film & Technology (SIFT), Mumbai
• MIT Art, Design and Technology University,Pune

All the best!!