Yes someone can sponsor you. It can be your friend/relatives. You can ask them to sponsor you and the great thing is both of you will get a share. The other people that can sponsor you are the steemians here in steemit that runs a contest with sbi prize. Just search for those kind of contest. You can exert your efforts to win that share or sometimes you just need to test your luck because most of the sbi contest uses random generator to pick the winner.
To easily find the lists of sbi contests. You can follow @steembasicincome, they are finding a lot of contest that gives sbi shares then they compile it in a single post. So that it will be easy for everyone to see and join these kind of contests.
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