Can I use 3 pairs of sda and scl at the same time in one arduino?
Yes. At a certain point pullups become an issue, but three is usually ok.
How many master and how many slave devices?
You may need to use an I2C Multiplexer.
Hi, @anughmei
What do you mean, from the thread title it sounds like you want to run, 3 pairs of I2C busses.
Are you aware that you can run more than one I2C device of the ONE I2C bus?
What is the application?
What are the sensors?
What is the model of the Arduino controller?
Thanks.. Tom... 
I stockpile these:
you can run a 10k resistor from one ground to SCL and the VCC to SDA and have a device to experiment with pullups and pulldowns on ESP32s
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