Speaking to the press ahead of Town's FA Women's National League Southern Premier Division clash, Sheehan said his promotion-chasing side can't wait to walk out at the Blues' famous ground again.
TICKETS: Get half-price tickets to the game with us!
Natasha Thomas was on the scoresheet at Portman Road last yearNatasha Thomas was on the scoresheet at Portman Road last year (Image: Ross Halls) "It will be a good occasion and we are looking forward to it," the Town boss enthused.
"It seems to have come round really quickly. I haven't personally spent too much time thinking about it over the last few weeks with priorities lying elsewhere.
"We're very focused internally. We're committed to being really good everyday and if we can do that, be prepared and reflect and review games as we have, then we have a really good chance of performing well."
Sheehan's side sit second in the table with two games in hand over firstSheehan's side sit second in the table with two games in hand over first (Image: Ross Halls)
Sheehan was in charge last season when Town Women played at Portman Road for the first time, beating Chatham Town 5-0 in front of over 10,000 people.
"My memories from last season include the incredible attendance, the coach arrival, seeing so many supporters. It felt like a typical men's matchday", he said.
"Our focus was to be trailblazers, to inspire the community and see so many fans come and watch us and put on a performance that will leave a lasting memory and that was something I remember too.
"It was an electric start. I think Sophie Peskett dribbled the ball really early on and you could just hear the roar of the crowd.
Sheehan managed the side last season at Portman RoadSheehan managed the side last season at Portman Road (Image: Ross Halls)
"That is something that really stuck with me.
"We will be hoping to do that again and get a really bright start and get the crowd up."
It is hoped the crowd this year will surpass the attendance from last year, with at least 12,000 fans expected.
They will roar on the Tractor Girls, who are currently second in the table but hold two games in hand over leaders Hashtag United, who are three points ahead.
Sheehan said: "We know that lots of people are coming on Sunday expecting to see us win, but we are not really distracted too much by that.
"We are completely detached from the outcome of games and just focusing on day to day and getting everything right.
"It's all we have done and it's definitely something we've committed to and really doubled down on in terms of our focus and hopefully that will enable us to perform really well on Sunday."