compare it to a real world sandbox which doesnt have reinforcement timers on sand castles and it fails to be a sandbox.
OR
You can use the technical definition of a sandbox which amongst a great many other things requires a game to have no forms of progression and since EVE has SP whether you wait it out the old fashion way or buy it with injectors it is still progression and EVE fails again to be a sandbox.
In short, EVE isn’t even vaguely a sandbox game, humans are more closely related to a turnip than EVE is to a sandbox game.