Learning Dutch.
 

Hello, I need to find out if I could get a 5 to 6months Dutch Learning course in Belgium (preferably Flanders area) from April to August. Please kindly share your ideas of institutes or learning centers through which I can learn dutch for that period of time.

Regards.

'(preferably Flanders area)'
that's a good idea of you want to learn Dutch :-)
You can find Dutch courses in Brussels and Wallonie, but everyone on the street will speak French.

No personal experience, but try Huis van het Nederlands.
http://www.nt2antwerpen.be/
It's a Flemish government organisation. They will be able to find a course that suits you.

Can I ask why you are learning Dutch in Belgium?

Good for you, wanting to learn Dutch. Good luck getting a visa. Not simple.

Thanks to those who gave helpful links. God Bless you.

Before you pay for any courses out of your pocket, check out the info pages for (potential) immigrants:
http://www.inburgering.be/en

You'll probably get a free voucher for the language course, counseling, career information, and other information/integration courses.