"It was a very difficult few weeks," he told BBC Berkshire. "I've been at the club a long time.
"It would have been an easier option to stay on here because of personal and family reasons, but I now look forward to a new challenge with Ipswich."
Ingimarsson admitted his last season at Reading had been a difficult one.
"I was injured for a long time - probably longer than expected - and I had an operation which totally fixed my problem," he said.
"The opportunity came to play and I thoroughly enjoyed that - I played something like 13 games in a row and it went very well.
"But after the Forest game I found myself in the stand and that was a little bit difficult to take, and from that I knew my future was somewhere else.
"The club and the manager want younger players and to build a different team.
"I always knew that when you get to my age people don't look at me as a long-term plan. So it's a mixture of those things."
Ingimarsson added that he had been impressed when he met Ipswich manager Paul Jewell.
"He told me about what they're trying to achieve," he explained. "They want to bring in a couple of players and try to go for it.
"That sold it to me - I've played at Ipswich on many occasions and it's a nice stadium with a good fan base as well, and it's a club which has a good chance to get promoted."
But Ingimarsson admitted that despite the move, Reading will remain close to his heart.
"The people that I know well are still going to be my friends whether I move away or not," he added.
"But I had my life here for a long time and my family has basically grown up here. We'll keep our main home where we are and I will commute over there, causing as little disruption for the kids and the family."
Source: BBC Sport
Source: BBC Sport