Sri_chikoo:
So basically i need use a 3.3V voltage regulation as power inputs for my TMP102 and SD card.
That would be a good idea. I would also power that regulator off the 9V, not the Mini's 5V.
Sri_chikoo:
Do I just need to use one pull up resistor for Each I2C line for both the devices?
It depends on how far the devices are from each other. Generally only one (on SCL and one on SDA) is needed.