Interactive Brokers is an American company offering one of the most popular Trading platforms globally and, yes, Interactive Brokers opens accounts to clients residing in Belgium. However, please note that the platform might not be suitable for Beginners since simplicity is not how you would describe it. It does offer many features for Pro Traders, but if you are not part of a Dealing Desk of a Big Financial Institution, perhaps you might want to try a simpler [And cheaper] option.
XM: BROKER AVAILABLE IN BELGIUM [A GREAT ALTERNATIVE TO INTERACTIVE BROKERS]
XM is a Forex and CFD broker with one of the largest market penetration rates because it provides a large number of currency pairs and CFDs on international financial instruments like stocks, indexes, metals and energy. These instruments are available through MetaTrader 4 and 5, two of the most popular Trading Platforms worldwide. XM has more than 2.5 million accounts from clients all over the world and is aimed to both beginners and professional investors. A cool thing about XM is that it offers a USD 30 bonus for new accounts [The bonus doesn't require you to deposit money in advance]. So, go ahead, claim the bonus, and try XM, it is indeed a great alternative to Interactive Brokers. By the way, opening a Trading account with XM is quite easy, you just need to upload an ID and a Proof of Residence through their App.
CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 75.55% of retail investor accounts lose money when trading CFDs with this provider. You should consider whether you understand how CFDs work and whether you can afford to take the high risk of losing your money.