Generally, no. You can't directly book a Week out of season. You could book a Week in your season and deposit it into II for an exchange back in to the season you want. Or if your Week is eligible for enrollment in the DC you could enroll it and convert it to DC Points, then use the Points to book the interval you want (which in most cases will only work if you're giving up a higher-demand season for a lower.)
There are a few resorts that have "Platinum Plus" fixed Weeks in their calendars that can be booked in Platinum season. But not all resorts have Plat Plus Weeks, and not all Plat Plus Weeks can be directly booked into any Plat Week.