The Isles traded for the veteran defenseman, sending back a conditional fifth-round pick in the 2015 NHL draft to the San Jose Sharks that will become a fourth-round pick should Boyle sign with the team.
Boyle, 37, is coming off a six-year, $40 million dollar deal with the Sharks. He had 12 goals and 36 points for San Jose this season and is regarded as one of the most smooth-skating, mobile defensemen in the game.
If the Isles are able to get him under contract, this will be the second time this spring they have gained a solid veteran player in this type of trade.
The Islanders signed goaltender Jaroslav Halak to a four-year, $18 million deal last month after obtaining an exclusive negotiating window via trade with the Washington Capitals. The Isles sent back a fourth-round pick in that trade.