A former Ireland captain, Simon played 65 times for Ireland between 2000 and 2008 and was a member of the British & Irish Lions tour squad in 2005.
Easterby first captained Ireland in the 2005 GUINNESS Series and now nine years on he will make his coaching debut this November with games against South Africa, Georgia and Australia.
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"He is well known to Irish rugby supporters and to many of the players and his knowledge and experience will help drive the team forward."
Easterby added: "It's an exciting time to be involved in Irish rugby and I am looking forward to helping the team continue to be as competitive as possible."