It's not clear, where it comes from, but look into the stadium, the 100-Meter-Run. In Front of the people and in every TV, they run from left to right. It's counter clockwise. On all sports, also ice skating, bicycle and even swimming, the goal is on the right side.
Think of people with bathing stuff, who cross the street. When they go from left to right, you think they are going to the beach. If they go from right to left, it doesn't mean, the beach is on the left side, it means, they coming back.