A total of 35 extras helped Spain hit 158-7 in their 10 overs having been restricted to 28-4 off the first three.
Muhammad Ihsan made 63 not out off 24 balls and put on 107 for the fifth wicket with Muhammad Yasin.
Asa Tribe’s 47 and a 17-ball 40 from Jonty Jenner saw Jersey have the chance to win, but the hosts held on.
Jersey’s bowlers started brilliantly as Julius Sumerauer and George Richardson each took two wickets as Spain staggered to 28-4.
But when Ihsan joined Yasin they clicked as they hammered Jersey all over the Cartama Oval.
They were helped by some pretty desperate bowling with 19 runs coming off wides, as well as six off byes and five off no-balls, while Jersey were further hampered as Spain got five penalty runs for a slow over rate.
Yasin was finally caught by Theo Pullman off Tribe’s bowling for 37 off 22 balls while Ihsan kept his wicket intact as he smashed seven sixes and four fours.
In reply Jersey started superbly as Patrick Gouge crashed 37 runs off 13 balls as he and Tribe put on 64 for the first wicket in three-and-a-half overs.
Jenner came and smashed a quickfire 40 that included 28 runs off the seventh over while Tribe was dismissed with the penultimate ball of the ninth over having hit four sixes and three fours.
Josh Lawrenson came in and looked to be guiding Jersey home as he hit 14 off five balls, but when he was caught on the boundary going for a six with the penultimate delivery Jersey needed a maximum off the final ball to win – but debutant Elliott Corbel was also caught out deep as he tried in vain to win the game.