Finally, I found the answer that how to save the drawing sheets in FreeCAD from Python console. In FreeCAD, whenever we created a new drawing sheet its get stored as temporary file in our system. The below code is used to find the location of the drawing from Python console:

import os
import subprocess

obj = App.ActiveDocument.getObject("Page")
page = getattr(obj, 'PageResult')

The page variable stored the location of the drawing sheet in SVG format.

Converting SVG format to PDF format by using Inkscape:

import os
import subprocess

obj = App.ActiveDocument.getObject("Page")

# Path to Inkscape executable
inkscape_path = "/usr/bin/inkscape"

# Exported PDF file location
file_location = os.path.expanduser("~" + os.sep + obj.Label + ".pdf")

page = getattr(obj, 'PageResult')
call_inkscape = [inkscape_path, "-f", obj.PageResult, "-A", file_location]
subprocess.call(call_inkscape)

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