Allies of former President Donald J. Trump formed a new super PAC days after Corey Lewandowski, Mr. Trump’s former campaign manager and the leader of one of the largest pro-Trump super PACs, was accused of sexual misconduct.

The move, an attempt to isolate Mr. Lewandowski and deny him a role in Mr. Trump’s political operation, creates a new outside group to support the former president as he considers whether to run again in 2024. It also hints at the internal tumult that continues to divide the wide circle of formal and informal Trump advisers.

Last week, a donor to Mr. Trump, Trashelle Odom, made the allegations about Mr. Lewandowski in a statement. Mrs. Odom accused him of making unwanted sexual advances and touching her inappropriately at a dinner in Las Vegas.

A spokesman for the former president, Taylor Budowich, indicated last week that Mr. Lewandowski would be removed from his role overseeing the super PAC, Make America Great Again Action, and “will no longer be associated with Trump World.”

But Mr. Lewandowski has told associates he has not been removed. He is one of the entity’s two board members. The new super PAC formed as a result, calling itself “Make America Great Again, Again!” — a repurposing of Mr. Trump’s 2016 campaign slogan.

Mr. Lewandowski did not respond to a request for comment.

The new group filed paperwork with the Federal Election Commission on Friday. It will be led by Pam Bondi, the former attorney general of Florida, and Kimberly Guilfoyle, the former Fox News personality who is dating Mr. Trump’s oldest son, Donald Trump Jr.

Whether Mr. Lewandowski is banished from the Trump orbit and its network of wealthy donors is far from certain. The former president is known to bring aides he has fired back into the fold, including Mr. Lewandowski, who was removed from Mr. Trump’s 2016 campaign but continued to enjoy access and influence at the White House.