Is there any way to increase its sensing distance . Or do you guys have any other sensor having better sensing distance with a angle of 60 degree +
Hey,
We certainly have plenty of interesting options, most of them DIY or more expensive, though. 
For a simple starting point, have a look at this article. This example uses a sensor with 40 m of maximum range, which is certainly quite a bit more than the RB-Dfr-294. You can find plenty of longer ranged sensors here.
If you do not mind building your own (sensor+bracket+double-sided tape+servo motor), you may want to check out the RB-Ben-03. It is quite inexpensive and has a maximum range of 12 m, which is a definite improvement from the sensor inside the RB-Dfr-294. Using the article linked above as a starting point, you could easily make a rotating turret for your sensor in minutes!
We hope this helps!
Sincerely,