Well I think the obvious suggestion would be The Green Mile as it's very similar. It was also written and directed by the same director (Frank Darabont/Steven King). Both are great, but I prefer Shawshank.
I just googled for a list of films similar to Shawshank and this came up: https://www.scoopwhoop.com/Movies-You-Need-To-Watch-If-You-Loved-The-Shawshank-Redemption/#.v1x4081l4
Green Mile is number three on there.
Awesome, thanks! TBH, surprisingly, I haven't seen Green Mile yet, so I'll give it a look
I can't see why you wouldn't like it. It's very similar, but as I said I prefer Shawshank as do most others. I need to watch them both again, though.
I was meaning to see that in theatres but wasn't sure about it. I'll surely take a loot at it!
As for Green Mile: Honestly if it can even come close to Shawshank, I'd be ok. I know that movie is a heavyweight to compete against.
Let me know how you find them both.