it depends. for example, naismith was just a regular citizen that was asked to come up with an indoor sport for winter. so it could be an inventor,scientist, retired sports player, or just an average joe.
Well, when the first child who threw, say, a mammoth tooth at his father, and his father smacked it aside with, say, his stone headed spear, repeat, and Bam! a sport that resembles Baseball. Sports have been around ever since man has had time to do them, so, of course, because history doesn't go back that far, no one can answer that question. Sorry.
No one person really created sports but it was created individually.
UK Sport was created in 1997.
The Sport of the Gods was created in 1902.
Kookaburra Sport was created in 1890.
ITV Sport was created in 2004.
Memphis Sport was created in 2006.
Sport Coopsol was created in 2000.
Sport Klub was created in 2006.
Véloce Sport was created in 1885.
SBS Sport was created in 1980.
Sport Week was created in 1929.
Sliedrecht Sport was created in 1956.
ABC Sport was created in 1956.