The German Gepard is also a tank, but it's not a main battle tank.

I don't know whether any currently existing main battle tanks are designed to cope with drones. However, presumably someone has designed one already at a company currently manufacturing tanks (because they would be out of business otherwise) and certainly one could be designed (the trivial solution would be to add a Gepard style weapon (or a laser) to a main battle tank). Not a single modern (designed in 2020s) main battle tank has seen combat, so it's entirely possible that there are already defenses, but thy are just kept as a strategic advantage. War is like playing chess without knowing the pieces on the board. There is a huge advantage in the enemy not knowing you are twenty years ahead. There needs to be some publication of what is available, but you always need to hint at the reality that they don't get to see every toy you have in your arsenal.