Earlier this month, the Supreme Court of Appeal (SCA) denied Motsoeneng leave to appeal against the High Court ruling that found his permanent appointment as chief operating officer was illegal.
Just under 100 people, wearing red and black Right2Know campaign T-shirts, say they want FNB and other big advertisers to stop taking their business to the SABC.
The campaign's Micah Reddy says the crisis at the public broadcaster needs to be addressed.
As group executive of corporate affairs, Motsoeneng will oversee all provincial offices of the SABC.
The demonstrators are expected to march to SABMiller.