Dear Rahul,

There are lots of school in dehradun for sports like;

• Abhimanyu Cricket academy
• Doon shool
• St .Jospeh  Academy
• Bhaichung bhutia football school

Im happy to said that you want be a sports man, but as per query you are  not tag for specific sports, but before you join any academy ,or school you have to choose in which sports u have interested,likes your skills matched to that filed or not .Then after you will start your sportsman journey .

I hope it will help full for you

Thanks and best of luck for your future..