Yes, you can get one when you go to the park at the guest services building on the right. The first time is free, and after that it's like a $10 fee or something if it happens again.
If you are to find your season pass after you have replaced it, throw out the old one immediately. I did not know I had to do this when it happened to me last year. I found my old one and used it, and was not able to enter the park because I did not have my new one with me. I had to pay $10 to get yet another new one.