If you do a bit of a google you will find plenty, I have often found that going to individual college websites and checking directly gives best results. Off the top of my head IT Sligo do offer some science degrees distance learning.
I have to ask the question, if its distance learning, why does it have to be in Ireland? Surely it wouldnt matter where if it was distance - is that not the point of distance learning? Many of the UK universities offer good properly accredited distance learning programs in science or science subjects. Open University offers the best programmes of course, but they have had a huge price hike due to funding being pulled so might not be an affordable option anymore.