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Unfortunately, no. You'll need to explore new chunks. Although, changing the world type to BIOMESOP should break some things and cause land to generate instead of ocean, however ugly the transition from ocean to land may be.
Considering this deathly old topic is now revived, I may as well mention that you can add xycraft into your custom modpack, just as long as you don't distribute the pack.
If a mod author doesn't want their mod in a custom modpack, there's nothing stopping you from ignoring them and adding it...
That's vanilla world gen. The ocean biomes are enormous.
I can only suggest you go into creative mode and make some landfills if you want to continue building on solid land.
Because somebody accidentally spilled four hundred pellets of light blue food coloring into the sky.
Why don't I have a bunch of random things on my desktop?