Audiences will get a peek at “G.I. Jane” at not one but two Saturday-night sneak previews.Buena Vista’s Demi Moore vehicle, helmed by Ridley Scott, has been pushed back from Aug. 15 to Aug. 22. Sneaks are set for Aug. 9 and Aug. 16. The unusual move signals the studio’s confidence in the picture — and perhaps its hope of overcoming what many perceive as Moore’s declining popularity. “This is a case where you’ve got the goods. It’s one of those films everybody loves when they see it,” said Chuck Viane, BV senior VP and general sales manager. “We’ve got to get it out there and let the public do the talking.” Exhibitors have generally reacted favorably to the film. But so far, pre-release tracking shows only minimal interest in the picture. Plus, there’s Moore’s recent domestic track record: The highly paid actress in the last two years has starred in a string of commercial disappointments, including “Striptease” (with a domestic gross of $33.1 million), “The Juror” ($22.8 million), “Now and Then” ($27.1 million) and “The Scarlet Letter” ($10.4 million). Her last hit was the 1994 corporate thriller “Disclosure,” in which she starred opposite Michael Douglas. “Jane” will likely sneak in about 900 to 1,000 theaters, Viane said. The film is R-rated, which means it will have to play with BV’s “Nothing to Lose,” as well as films from rival studios.