Chairman Des Johnston added: "Steve had to make a decision before tomorrow [18 August].
"We agreed before the Toulouse game that he would remain as head coach until the end of the season. However, Steve felt with a starting date of September, he could no longer dedicate his full-time commitment to Barrow.
"It was decided this morning between myself and Steve that the club would not stand in his way and deny him this great opportunity.
"On a personal note, I have enjoyed thoroughly working with Steve and he has my utmost respect. I cannot speak highly enough of him.
"He has been very unfortunate this season with a horrific injury list, and myself and the board of directors wish him and his family every success and good luck for the future."
McCormack's resignation comes just 24 hours before Barrow meet Widnes at home in a re-arranged Championship match.
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