magazines of the time show he entered, but did not place.
This is even more interesting.
After three years of Naval service, a long bout with a stomach ulcer shortened his "naval career". He returned to Edinburgh and seemed to settle into a life of hard work: bricklayer, lifeguard, and coffin polisher. Sean spent much of his free time bodybuilding, a pastime that eventually started his acting career. His hobby of bodybuilding culminated in a bid for the 1950 Mr. Universe title where he placed third.
http://www.seanconnery.com/biography/Sounds like a lot of lies all around.