"Except with the prior written consent of the board no person who is involved in any capacity ... in the management or administration of a club may at the same time either directly or indirectly be involved in any capacity ... in the management or administration of another club," the SFA said in a statement on Monday.
Ashley owns Newcastle and also has a 10 percent shareholding in second tier Rangers.
Earlier on Monday, Ally McCoist tendered his resignation as manager of the 54-times Scottish champions but will be given a salary rise while he serves a 12-month notice period.
(Reporting by Tom Hayward, editing by Tony Jimenez)
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