The PCB says he will take up the role for the upcoming Test and one-day series in Australia. It will be Younis's second stint with the national team, having previously been bowling coach in 2006.
Younis, 40, took 373 wickets in 87 Test matches before retiring in 2003. He also claimed 416 wickets in 262 one-day internationals, and formed a celebrated pace combination with Wasim Akram.
He captained Pakistan in 17 Tests and 62 one-day internationals.