I'm deeply ashamed, but I gave a wrong clue! The game is not in 3D, but uses a split screen. I found it again
The game is Field Master v.1.0
It's a 2 player game and the goal is to destroy eachother's tanks. The map is quite large. I have to investigate if this game is mentioned on the Generation MSX site.... if not I'll send the information 
Thank you MäSäXi for your extensive search and again sorry for giving the wrong clue, but please understand it's almost 20 years ago when I played it for the last time. It gives great pleasure to play it again after this long period.
And also thanks to everyone else who did search
Field Master!!!!!! Loved that game!!!!!!!!!!!! I think it's a basic game, but really nice. Had months of fun with it "back in da days". 

Yes it's a BASIC game, but a nice one this time!
The game was firstly published as a BASIC listing in the September 1984 issue of LOGIN (a mag?) and later being part of the MSX GAMEBOOK+tape.
Seems that someone ripped the game and was distributed under the credits of "CIA & (PMM), Jose Luis Abellan" where the real programmer seems to be Ken'ichi Inui...
More info here
Thanx for the additional information
W76NearDark, it was just nice to help you. 
by the way, Field master looks very good!
Ah, that tank game! I actually played that a lot. Didn't even remember it until I saw the screenshot.
It was a "hidden treasure" on my parents attic
