Hey Sanket, if you want to rent the tent in Gokarna, it depends where you want to pitch. Like, you have good option to stay in tent at Paradise beach. You will get it in 400 rs there iteself. Also, at half moon beach there are huts and tent which u can rent out at the same time. OM and Kudle beach are not recommended for staying at night due to over crowded .
Sorry Sanket but this is isn't possible according to me and also https://www.tripadvisor.in/FAQ_Answers-g651646-d2630802-t3449223-Can_i_get_tents_for_rent.html