Send packet of multiple sensors data to Bluetooth module
There are many ways to transmit binary data over a byte-stream based interface like Serial (which is used by common bluetooth modules like the HC-05/HC-06). I will only describe one here.
First we need to define a start byte, which marks the start of a new packet. That can be any arbitrary value, for example 0xFF. It is also possible to use a specific byte sequence as start marker. This start byte/sequence is what we send first when transmitting a packet.
Then we want to transmit the size of the following data. With small to normal packet sizes a single byte is enough here (giving room for up to 255 bytes).
Sometimes you might want to compute a CRC hash value to check for data corruption. That could also be send here. But unless you have a system, which really is loosing/corrupting data, you don't need it. I suggest you first try it without and check, if corrupted data is really a thing for your setup.
And then we are sending the actual data. How exactly you are doing this depends on how the data is stored in your code. Though you will use Serial.write() in some way. If you want a more specific answer in this regard, you need to include your code, so that we can see how you are storing your sensor data.
On the receiving side you would then wait for the start marker, read the size byte and then read bytes until you have received as many, as the size byte said. As you have multiple sensors, you could send the sensor data of each sensor in it's own packet. The data could then be formatted like: 1 byte sensor ID, X byte sensor data.