i'm assuming you got a shared hosting environment. if they must exist on the same directory, try looking at the following article https://stackoverflow.com/questions/42605396/setup-laravel-in-shared-hosting
if you can create a subdomain like mylaravelapp.yourdomain.com, you can still follow the article above. it just separates the two sites. otherwise, i'm not too familiar with shared hosting environments as i don't run any laravel sites on them. hope that helps.