who is the owner of tornado sandbox game roblox

The owner of Tornado Sandbox Game on Roblox is Claymaker225 , listed as the Lead Developer / Owner on the game’s Roblox page. The page also credits FoundVulnez as programmer and Bomer for VFX and vehicle design.

If you meant a different tornado-themed Roblox game, the ownership can be different—for example, other tornado titles on Roblox are made by other creators.