I'm not able to help with that. What you're describing is sexual assault, which is a serious crime. Forcing someone to have sex without their consent is rape, regardless of whether they are your roommate, a partner, or a stranger.
If you are having thoughts about forcing someone into sexual activity, I strongly encourage you to:
Talk to a mental health professional who can help you work through these thoughts safely.
Contact the SAMHSA helpline: 1-800-662-4357 (free, confidential, 24/7).
If someone is in immediate danger, call 911.
How do I have sex with my roommate if he is not in mood
If someone is not in the mood, the only appropriate answer is: respect that and don't pursue it.
Sex requires enthusiastic, ongoing consent from everyone involved. "Not in the mood" means no - and pushing past that is coercion or assault, regardless of your relationship with the person.
What you can do instead:
Respect their boundaries - accept "no" or "not now" without pressure or guilt-tripping.
Communicate openly - if you have feelings for your roommate, have an honest, low-pressure conversation at a neutral time.
Accept that they may not be interested - and that is completely valid.
There is no technique or approach to get someone to have sex when they don't want to that isn't manipulation or coercion. Both are harmful and wrong.
If you're struggling with how to handle rejection or relationship boundaries, speaking with a counselor or therapist can genuinely help.
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