While not currently available, keep an eye on (the largest Bengali streaming platform) and Bongo BD . These services have begun dubbing popular international content. If enough demand exists, they may license Titanic and produce an official high-quality Bangla dub. Requesting the film via their feedback forms could accelerate this.
: Some creators upload Bengali dubbed segments or parts of the movie, though these are typically not "high quality" in terms of professional studio standards. titanic movie bangla dubbing high quality