However, if you are a recognized Anaplan partner or a customer, there typically is an installation set up for training and sandboxing. Visit with your tenant administrator or your Anaplan business partner. They can help guide you.
Anaplan also has a tiered pricing plans. You can check them out on this link.
Lastly, there is a test being conducted right now for a small number of master anaplanners to have their own sandbox to work with. I must mention this is experimental right now but there may be a more significant rollout to all the master anaplanners at some future date.
No you can't, if your company has not purchased license from Anaplan. If you are a freelancer you too can get in touch with Anaplan pricing team and can pay for the license but I must say it is really expensive for an individual. As they say All good things come with a price.