A place where the sun is up,
The land that is cut from all.
Here the people coverup,
Once had men come by crawl.
Might be too broad, will post more lines later!
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Japan
A place where the sun is up,
Known as the land of the rising sun
The land that is cut from all.
It's an island nation
Here the people coverup,
The traditional kimono covers most of the body
Once had men come by crawl.
Trench warfare in world war II?
Is it maybe:
the poles?
A place where the sun is up,
In summertime, the sun is always above the horizon at the North Pole, and the opposite stands for South Pole, because the Earth is tilted.
The land that is cut from all.
Poles are cut from other land.
Here the people coverup,
It's freakishly cold, they better do!
Once had men come by crawl.
Not really sure, but for humans (maybe better say explorers) is very hard there. Especially when you go to sleep you need to crawl in you tent/sleeping bag/any kind of hideout.. maybe that explains the last part?
This attempt is an addendum to the answer from @jafe:
Japan
Here the people coverup,
Ninjas are essentially covert operatives
Once had men come by crawl.
Yobai, or "night crawling", involved men "silently enter[ing] houses with [...] women" (Wikipedia)
Maybe-
Deserts
Explanation-
Always sunny and hot, people cover up because of the sun and sand, and thirst can often make you crawl.
Just a wild guess:
Antarctica
A place where the sun is up,
Well... right now it's springtime there and the sun is starting to come up. It'll be there for quite a while.
The land that is cut from all.
Literally.
Here the people coverup,
Walking around without a thick layer of clothing would be unpleasant.
Once had men come by crawl.
Antarctic explorers of old? Probably crawling was involved at times.