Sleep training

I know it’s so late. And it’s gonna be hard but I have to do it. I love the cuddles and I love bed sharing but for his sake I need to do it. I can tell he is uncomfortable and I feel like he’s just such a horrible sleeper sleeping with us. But we share a room. My thing is maybe we just sleep on our pull out couch until he’s ok and sleeping through the night?.. any mamas sleep train while sharing a room? I think I might not really check in at all. He would be the type that would get worse if I kept checking on him. Just would love any tips any mamas have. Also plz if you’re gonna judge don’t even bother commenting thank you.