The 22-year-old has played over 200 games over the last five seasons with Peterborough Phantoms and Basingstoke Bison.
Storm boss Ryan Finnerty said: “I’m really pleased to have secured Declan’s signature ahead of next season.
“He’s a solid player on the ice and a great teammate. The references I got on him were all very positive.
“I fully expect him to do really well in his first season in the Elite League.”
(Image permission: Grant King)