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The seven-time Bathurst 1000 champion is set to partner Stephen Grove in a two-car Grove Racing line-up.
The Australian GP support races, which include a 45-minute enduro, will mark Lowndes' first appearance in the one-make series.
However it will be his second start in a Porsche for the year, having debuted for the brand as part of the factory-backed Earl Bamber Motorsport line-up at the Bathurst 12 Hour.
“I’m really excited about the opportunity to continue with the Porsche family following the Bathurst 12 Hour,” said Lowndes.
“The Australian Grand Prix is a global stage and a great track, so I can’t wait to get back behind the wheel and compete in the Porsche Carrera Cup races.
“It will be a challenge given it’s my first outing in the category, which is highly competitive, but I’m looking forward to seeing what I can do.
“A big thanks to the Grove Group and Porsche Motorsport Australia for the opportunity.
“Once a racer always a racer – that side hasn’t changed for me, so I’m looking forward to the event and seeing what the rest of the year brings.”
Porsche enduro added to Australian GP schedule
Full 2020 Australian Grand Prix weekend schedule