AFAIK, no, and it does not sound easy to make a mod that tinkers with victory conditions.
A few years ago someone made a mod called "wonder victory" where you'd have to complete several wonders to win, but even then they had to use several workarounds to get around hardcoded restrictions.
What are you trying to achieve though, if you just want to delay victory then you can mod it so that it's harder to accomplish say a science victory or a tourism breakpoint.
