Last updated: May 22, 2015 12:16
Murray will sign a two-year deal at St Mirren Park. The Saints have been relegated to the Scottish Championship after a disappointing season.
Former St Mirren boss Tommy Craig was sacked in December after a terrible start and thereafter interim boss Gary Teale was unable to steer the Paisley club to safety.
Murray, 34, guided Dumbarton to seventh in the division this season after securing a fifth-placed finish in 2013-2014.
“Ian Murray leaves role as Sons manager to join newly relegated St Mirren,” an official statement on the Dumbarton website said.
“Murray accepted the position at the Paisley club following a recent interview process and will be officially unveiled at St Mirren Park later today.”
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