It does appear that your husband has a psychological issue about having sex with you since your hysterectomy.
You need to speak with your husband and reassure him that having sex will be just the same as before. Better now because there will be no risk of pregnancy and he does not need to use any precautions.
The other problem may be that he has difficulty in getting erections or other problems with his own manhood. He may need to see his doctor to check that he is not low on testosterone.
Make sure that you both take part in cuddling each other and taking part in lots of foreplay to help each to get aroused.
What you can do is pelvic floor exercises to tighten and firm up the muscles around the pelvic floor.
Best wishes.
It would not be the uterus but the vagina that your husband gets pleasure from. The penis rarely even reaches as far as the uterus. Even if you had a fake one (there is no such thing) it would not change any sensation for him.
The real question is why he is not feeling pleasure in having sex with you. Some men are only excited about sex with women they think are fertile (a psychological issue, not physical). Or perhaps you are not having as much lubrication as before? (The latter is solved by KY Jelly and other personal lubricants.) He might just have a mental block that hysterectomy is for older ladies and sees you in some way as less desirable because of that. This one is easy to fix with sexy underwear and a racy attitude. But you need to know why your hysterectomy made such a difference to him. Very rarely, a woman gets a stretched-out vagina after many childbirths and if that is the story, perhaps your ob-gyn can suggest a surgical procedure to tighten the vagina. But you REALLY need to know why your husband feels the way he does, to be able to solve the problem.