Moving is hard on the little one. They get comfortable with their surrounding and then you change. I would think that it isn't helping with when you move things around and move him to his brothers room and sleep with him on the couch. I would think that has prolonged it even more. (just my thought)
I moved also when my little girl was 1 yr old. That may have been a little younger and that may have made a difference but what I did was make sure that I arranged her room as close as possible, even put stuff on the wall the exact same way as it was in the other house, the same furniture with the same things on the wall, everything as close as I could get it.
I think that if you did that, and walked in his room and picked him up and soothed him, talk to him and tell him it is alright that mommy has to sleep too and he needs to get his sleep and you can play in the morning, then lay him back down, pat his back or rub his back, give him a night light,cover him up and then say night-night and walk out gently and close the door and let him whine or cry for a little while, he will eventually stop and get sleepy till he falls asleep. Have a ritual before bedtime: bath before bed, bottle or snack or rocking or something that he can relate to bedtime. I think that it will be a pain for about 3 to 7 nights but after that, he will see that this is what he is supposed to do and he will learn to like his room. Also something else, if you play in his room with his toys during the day he will get use to that room, knowing that it is his and his toys, that will also make him feel more comfortable also.
I know this will be hard for a couple of night but a couple of nights is far better than for the next 6 months of no sleep.
Try this. I think that you won't be disappointed. By moving him around you are breaking his routine and showing him that it isn't the same and he wants a safe haven to sleep. He wants to feel comfortable. Also by putting him down asleep, he wakes up and is terrified because he isn't where he was when he fell asleep so he thinks that you have abandonded him. If you put him down when he is awake and you talk to him and tell him it is alright, he knows that everything is ok and he is safe.
I can even come in at night and check on my 2 yr old and cover her up and sometimes I will wake her up (she seems to be a light sleeper) and I will cover her up and sometimes she stands up and wants to be held and I will hold her, kiss her, swing with her in my arms and tell her night-night, put her back down and she goes right to sleep, no problem. I have trained her that way. She knows that is her bed and what happens when she goes in there. We have a routine at night. Da comes home, they swim in the pool for a while, we eat, she takes a bath, then her and her Da sit in the rocker and winds down while watching "jack's big music show' recorded from Noggin channel. Then they give me a kiss and he takes her and puts her in the bed. We have a monitor in our room and sometimes she will wake me up in the middle of the night talking and playing with her animals or reading a book to herself but she goes back to sleep on her own.
This isn't just her. I had 3 boys in another marriage 20 yrs ago before I had her and I did them all the same when it came to bed time and I have never had a problem with them sleeping. I did with the first one, this is what the pediatrician told me to do about the sleep and it has worked for all 4 of them, perfectly without flaws. So it works.
Good luck and if you need to talk, feel free to write.