SikuliX で作成したプログラムを実行すると、from sikuli import * が暗黙的に実行され、
起動した時点でsys や os、time などのモジュールがインポート済みになっています。

読込済みのモジュールは Pythonプログラムで sys.modules で確認できます。

for i in sorted(sys.modules.keys()):
    print(i)

実行結果

StringIO
UserDict
__builtin__
__future__
__main__
_abcoll
_bytecodetools
_codecs
_collections
_functools
_imp
_jythonlib
_sre
_weakrefset
abc
array
codecs
collections
com
com.google
com.google.common
com.google.common.cache
com.google.common.collect
copy_reg
dis
encodings
encodings._java
encodings.aliases
encodings.aliases._java
encodings.utf_8
errno
exceptions
functools
genericpath
heapq
imp
inspect
itertools
java
java.lang
java.nio
java.nio.charset
java.util
java.util.Collections
jythonlib
keyword
linecache
nt
ntpath
opcode
operator
org
org.python
org.python.core
org.sikuli
org.sikuli.android
org.sikuli.android.ADBScreen
org.sikuli.basics
org.sikuli.basics.Settings
org.sikuli.script
org.sikuli.script.App
org.sikuli.script.Button
org.sikuli.script.Constants
org.sikuli.script.FindFailed
org.sikuli.script.FindFailedResponse
org.sikuli.script.Finder
org.sikuli.script.Image
org.sikuli.script.KeyModifier
org.sikuli.script.Location
org.sikuli.scr
ipt.OCR
org.sikuli.script.Offset
org.sikuli.script.Region
org.sikuli.script.SX
org.sikuli.script.Screen
org.sikuli.script.SikulixForJython
org.sikuli.script.TextRecognizer
org.sikuli.script.compare
org.sikuli.script.runnerSupport
org.sikuli.script.runnerSupport.JythonSupport
org.sikuli.script.support
org.sikuli.script.support.RunTime
org.sikuli.script.support.Runner
os
os.path
re
sikuli
sikuli.Env
sikuli.Region
sikuli.Sikuli
sikuli.SikuliImporter
site
sre_compile
sre_constants
sre_parse
stat
string
sys
sysconfig
thread
time
token
tokenize
traceback
types
warnings