Anthony Eddy has left his role as the IRFU's Director of Seven and Women's Rugby.
His departure is with immediate effect.
There was a major reaction to comments by Eddy last November, which followed the Irish women's team's failure to qualify for the World Cup.
His remarks appeared to lay blame for the failure to make the tournament on the players' shoulders.
A number of international, past and present, criticised the remarks.
The findings of a report into the World Cup campaign and Ireland's failure to progress to the tournament will be revealed tomorrow.
During his time in the role, Eddy oversaw the qualification of the men's sevens team for an Olympic Games for the first time.
But the decline in the performance of the women's team in the 15-aside game has led to criticism of the Australian.
Following news of his departure, he said: "I am proud of each of the teams, the athletes, and staff that I have worked with.
"I wish all these people and teams the very best and thank the IRFU for their understanding.
"The last two years during Covid have given me time to reflect on the next phase of my career and life.
"It can be difficult living so far from home, family and friends.
"Having assessed everything, I’ve decided to change things up, and seek new opportunities."
IRFU Performance Director, David Nucifora, thanked Eddy for his efforts during his time in the position.
"I want to thank Anthony for the commitment and expertise he brought to his role.
"The IRFU have been very fortunate to have had someone of the calibre of Anthony to have built these programmes up from nothing. I wish him the very best of luck for any new challenge he takes up."The programmes will continue for now with existing staffing while we take some time to look for suitably qualified coaches to replace Anthony."