You can if you booked one of the top suites at one of the Disney hotels. The cost is 440K in the off season and 550K during the major season so including at least a one night suite stay, 1M JPY. Up to 6 people can be included in your 6 hour tour. You theoretically can book a tour with one of the 200K suites but my understanding is that guests in the most expensive suites can book tours first and when the window opens for the cheaper suites (1 month out according to some websites), there may or may not be tours available.
Now for the part that may be a challenge if you aren't Japanese. You must book your suite through the Japanese site and book the tour in Japanese. I know Japaense vacation packages require a Japaense residential address to send items to before your trip but am not sure about tours. It's possible you will need a Japanese address, phone number and credit card to book the tour. So unless you have a friend in Japan who is willing to book the tour and include you, booking a tour may not be practical.
Instead, you can book a vacation package on the English website which includes some of the VIP seating privileges for shows and purchase additional premier access to skip lines for some rides.
