Even if the plan is voted down by the party's 200,000 registered voters, Sharon will still present it to the Cabinet and parliament for approval, one senior official said.
"If worse comes to worse and the referendum is not approved, he will still try to push his plan through," the official said.
In proposing the poll last month, Sharon promised to honor its outcome.
"The referendum will obligate all leaders of the Likud, and me among them," he said at the time.
Sharon's plan, which also includes completion of a West Bank barrier and the expansion of five West Bank settlement blocs, appeared to be gaining momentum after the endorsements of US President George W. Bush and several key Likud ministers.
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