儘管規劃委員會今年早些時候已經原則上批准了該計劃，並認為 "第一個 "奧運長度的游泳池將成為 "國家資產"，但該計劃還是被拒絕了。
Plans to build a £6m Olympic-length commercial swimming pool on the Isle of Man have been rejected after an appeal from a nearby public operator.
Outline approval had been granted for the new facility by King William's College in Castletown in May.
But the decision has been reversed by Environment, Food and Agriculture Minister Clare Barber after objections by the Southern Swimming Pool board.
Her decision follows the recommendation of an independent planning inspector, who said the appeal should be upheld.
It was intended to be built on land leased to the charity by King William's College, with facilities open to rent by all sports clubs and schools across the island.
In a letter, Ms Barber said those behind the proposed complex had not adequately proven why the plans justified breaching a number of planning policies.
The location and the size would have an "adverse impact" on the landscape and setting of nearby registered buildings, as well as the views of nearby residents, she said.
An "overriding national need" for the facility had not been established by the developers, Ms Barber added.
The rejection comes despite the planning committee having approved the plans in principle earlier this year, arguing the "first of its kind" Olympic-length pool would have been a "national asset".