Which kind of visa do I need?

Hi, i'm a Networking Engineer and my job allows me to work anywhere, i would like to live in Japan, my question is that if i already have a job, i still need a work visa? or which kind of visa i need to acquire? thanks!

Japan would like to know why you need to live in Japan to do your job. You're going to need a work visa. In order to get a work visa, you'll need a sponsor. That is going to be your bump in the road.

If you want to move to Japan, than your company should arrange the transfer internally.
Better to ask the company you are working for if they can provide you the information.

Or you need to find a company in Japan to support your visa .
Which means you need to quite your current job.

If your company has an office in Japan and will move you, an "Intra-company Transfee" visa would be what you need.
If you start a company of your own, "Business Manager" visa, but one of the hardest to get.
Working for a Japanese company, a "Engineer/Specialist in humanities/International services" visa.
Working for a company not in Japan, but living in Japan - not really, but possible under a string of 90 day temporary permits under the visa waiver programme, but life will get complicated quickly.

Why didn't you look at the most obvious resource: https://www.mofa.go.jp/j_info/visit/visa/long/index.html

I'm not sure this has come across clearly in other responses:

You can't just choose to live in Japan. You need to show the government why it would be useful to them for you to be there - e.g. you can provide skills native Japanese people cannot - or that you have a clear reason to need to be in Japan long-term - e.g. you have a Japanese spouse or are studying there. Immigration is strictly controlled in most countries. It's not your choice, it's the government's.

Depending on your age and country of residence, you could apply for a working holiday visa, which would at least allow you to stay longer than a standard tourist visa.