We've no reason to believe the Doctor can't travel to a similar location in time, but at a different place. What he can't do, because of the time lock, is get into the events of the Time War. The term "event" is used to mean "a location in spacetime" -- it's 4-dimensional, a point in space at an instant in time. Even if he did get to a similar location in time at a different place, though, he'd still be excluded from the time-locked events. He couldn't get there by space travel, either.
The time lock is universal. All the spacetime locations (events) inside it are shut off from all the spacetime locations (events) outside it.
If you think about it, the time lock has to work like that or it'd be so easy to get around that there'd be no point in having such a thing as a time lock at all.