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The actress watched Beckham play for his team LA Galaxy recently and was impressed with his muscular physique.
A source said: "Nicole thinks David would be perfect to play a labourer in the film, and director Baz Luhrmann agrees.
"It would only be a small part and Nicole is hoping David might consider it."
Australia is a World War II musical epic which stars Kidman as an English aristocrat who falls in love with a rugged Australian, played by Hugh Jackman.
Beckham, who has cameoed in a couple of films, has previously insisted he does not want to forge an acting career.
He said: "I never wanted to be an actor. It has never appealed to me. When I finish my soccer career what I want to do most is spend more time with my sons and Victoria and do some work for good causes."
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